Final-Project-Analysis
Raphael Chevallier, Ty Kreway, Matt Carrier, Mark Meyer, Simran Tejay
4/1/2019
Cleaned data and setting up environment with dataset
#set whatever directory you have your data in
setwd("/Users/raphaelchevallier/Documents/DATA311/DATA311Project")
data = read.csv("Cost_of_living_index.csv", header = TRUE)
attach(data)
data## Rank City Cost.of.Living.Index
## 1 1 Hamilton, Bermuda 137.56
## 2 2 Zurich, Switzerland 128.65
## 3 3 Basel, Switzerland 126.89
## 4 4 Lausanne, Switzerland 119.62
## 5 5 Bern, Switzerland 118.42
## 6 6 Geneva, Switzerland 118.33
## 7 7 Reykjavik, Iceland 112.57
## 8 8 Lugano, Switzerland 111.88
## 9 9 Stavanger, Norway 111.00
## 10 10 Oslo, Norway 107.14
## 11 11 Bergen, Norway 102.87
## 12 12 New York, NY, United States 100.00
## 13 13 Trondheim, Norway 99.73
## 14 14 San Francisco, CA, United States 96.88
## 15 15 Honolulu, HI, United States 93.72
## 16 16 Anchorage, AK, United States 93.19
## 17 17 Brooklyn, NY, United States 90.31
## 18 18 Washington, DC, United States 88.50
## 19 19 Santa Rosa, CA, United States 88.27
## 20 20 Copenhagen, Denmark 87.91
## 21 21 Charleston, SC, United States 86.87
## 22 22 Luxembourg, Luxembourg 86.85
## 23 23 Bellevue, WA, United States 85.97
## 24 24 Seattle, WA, United States 85.51
## 25 25 Tokyo, Japan 84.78
## 26 26 Paris, France 84.68
## 27 27 Odense, Denmark 84.09
## 28 28 Berkeley, CA, United States 84.09
## 29 29 Jersey City, NJ, United States 84.08
## 30 30 Aalborg, Denmark 82.21
## 31 31 Amsterdam, Netherlands 82.14
## 32 32 Seoul, South Korea 81.96
## 33 33 Arhus, Denmark 81.94
## 34 34 London, United Kingdom 81.31
## 35 35 Oakland, CA, United States 81.18
## 36 36 Helsinki, Finland 80.60
## 37 37 Boston, MA, United States 80.46
## 38 38 Singapore, Singapore 80.40
## 39 39 Dublin, Ireland 80.28
## 40 40 Sydney, Australia 79.93
## 41 41 Hartford, CT, United States 79.85
## 42 42 Albany, NY, United States 79.38
## 43 43 Philadelphia, PA, United States 79.25
## 44 44 Tampere, Finland 79.04
## 45 45 Milton Keynes, United Kingdom 78.50
## 46 46 Grenoble, France 78.43
## 47 47 Irvine, CA, United States 78.38
## 48 48 Lyon, France 78.00
## 49 49 Long Beach, CA, United States 77.95
## 50 50 Linz, Austria 77.80
## 51 51 Los Angeles, CA, United States 77.66
## 52 52 Tel Aviv-Yafo, Israel 77.39
## 53 53 Barrie, Canada 77.37
## 54 54 Chicago, IL, United States 77.33
## 55 55 Stockholm, Sweden 77.23
## 56 56 Florence, Italy 77.21
## 57 57 Boulder, CO, United States 77.16
## 58 58 The Hague (Den Haag), Netherlands 76.75
## 59 59 Reading, United Kingdom 76.73
## 60 60 Auckland, New Zealand 76.63
## 61 61 Jerusalem, Israel 76.62
## 62 62 Bordeaux, France 76.31
## 63 63 Utrecht, Netherlands 76.30
## 64 64 Toulouse, France 76.30
## 65 65 San Jose, CA, United States 76.28
## 66 66 Burlington, VT, United States 76.11
## 67 67 Pittsburgh, PA, United States 76.04
## 68 68 Nice, France 75.84
## 69 69 Miami, FL, United States 75.83
## 70 70 Brussels, Belgium 75.69
## 71 71 Graz, Austria 75.61
## 72 72 Santa Barbara, CA, United States 75.55
## 73 73 Sacramento, CA, United States 75.54
## 74 74 Strasbourg, France 75.47
## 75 75 Genoa, Italy 75.38
## 76 76 Gent, Belgium 75.27
## 77 77 Perth, Australia 75.09
## 78 78 Antwerp, Belgium 74.88
## 79 79 Portland, ME, United States 74.81
## 80 80 West Palm Beach, FL, United States 74.79
## 81 81 Hong Kong, Hong Kong 74.73
## 82 82 Innsbruck, Austria 74.66
## 83 83 Leuven, Belgium 74.58
## 84 84 Leiden, Netherlands 74.56
## 85 85 Osaka, Japan 74.53
## 86 86 Melbourne, Australia 74.53
## 87 87 Bath, United Kingdom 74.48
## 88 88 Everett, WA, United States 74.36
## 89 89 Saskatoon, Canada 74.26
## 90 90 Tacoma, WA, United States 74.21
## 91 91 Portland, OR, United States 74.17
## 92 92 Rotterdam, Netherlands 74.08
## 93 93 Montpellier, France 74.08
## 94 94 St. John's, NL, Canada 74.05
## 95 95 Milan, Italy 73.89
## 96 96 Maastricht, Netherlands 73.87
## 97 97 Baltimore, MD, United States 73.85
## 98 98 Munich, Germany 73.79
## 99 99 Espoo, Finland 73.78
## 100 100 New Orleans, LA, United States 73.61
## 101 101 Galway, Ireland 73.54
## 102 102 Cork, Ireland 73.53
## 103 103 Padova, Italy 73.49
## 104 104 Haifa, Israel 73.42
## 105 105 Charlotte, NC, United States 73.33
## 106 106 Burlington, Canada 73.13
## 107 107 Aberdeen, United Kingdom 73.02
## 108 108 Dusseldorf, Germany 73.00
## 109 109 Minneapolis, MN, United States 72.93
## 110 110 Adelaide, Australia 72.92
## 111 111 Eindhoven, Netherlands 72.82
## 112 112 Cambridge, United Kingdom 72.60
## 113 113 Oxford, United Kingdom 72.60
## 114 114 Darwin, Australia 72.47
## 115 115 Eugene, OR, United States 72.46
## 116 116 Nantes, France 72.37
## 117 117 Groningen, Netherlands 72.29
## 118 118 San Diego, CA, United States 72.29
## 119 119 Ramat Gan, Israel 72.15
## 120 120 Hamburg, Germany 72.15
## 121 121 Bellingham, WA, United States 72.14
## 122 122 Atlanta, GA, United States 72.05
## 123 123 Denver, CO, United States 72.02
## 124 124 Saint Paul, MN, United States 71.94
## 125 125 Hamilton, New Zealand 71.91
## 126 126 Birmingham, AL, United States 71.87
## 127 127 Frankfurt, Germany 71.64
## 128 128 Wellington, New Zealand 71.52
## 129 129 Asheville, NC, United States 71.52
## 130 130 Trieste, Italy 71.51
## 131 131 Fort Myers, FL, United States 71.50
## 132 132 Newcastle, Australia 71.42
## 133 133 Portsmouth, United Kingdom 71.04
## 134 134 Halifax, Canada 70.88
## 135 135 Vienna, Austria 70.86
## 136 136 Heidelberg, Germany 70.82
## 137 137 Indianapolis, IN, United States 70.79
## 138 138 Edinburgh, United Kingdom 70.73
## 139 139 Jacksonville, FL, United States 70.62
## 140 140 Buffalo, NY, United States 70.59
## 141 141 Olympia, WA, United States 70.57
## 142 142 Saint Petersburg, FL, United States 70.49
## 143 143 Austin, TX, United States 70.49
## 144 144 Brisbane, Australia 70.46
## 145 145 Male, Maldives 70.45
## 146 146 Sliema, Malta 70.33
## 147 147 Rochester, NY, United States 70.25
## 148 148 Christchurch, New Zealand 70.23
## 149 149 Toronto, Canada 70.19
## 150 150 Orlando, FL, United States 70.18
## 151 151 Dunedin, New Zealand 70.16
## 152 152 Turku, Finland 70.13
## 153 153 Plymouth, United Kingdom 70.02
## 154 154 Swindon, United Kingdom 69.92
## 155 155 Canberra, Australia 69.88
## 156 156 Manchester, United Kingdom 69.86
## 157 157 Peoria, IL, United States 69.84
## 158 158 Gothenburg, Sweden 69.77
## 159 159 Cleveland, OH, United States 69.65
## 160 160 Vancouver, Canada 69.63
## 161 161 Limerick, Ireland 69.63
## 162 162 Bristol, United Kingdom 69.58
## 163 163 Brighton, United Kingdom 69.54
## 164 164 Bologna, Italy 69.50
## 165 165 York, United Kingdom 69.33
## 166 166 Karlsruhe, Germany 69.26
## 167 167 Raleigh, NC, United States 69.18
## 168 168 Bonn, Germany 69.14
## 169 169 Hobart, Australia 69.10
## 170 170 Arlington, TX, United States 69.07
## 171 171 Rome, Italy 69.03
## 172 172 Saint Louis, MO, United States 69.02
## 173 173 Bremen, Germany 68.93
## 174 174 Calgary, Canada 68.93
## 175 175 Milwaukee, WI, United States 68.81
## 176 176 Brampton, Canada 68.79
## 177 177 Nashville, TN, United States 68.78
## 178 178 Uppsala, Sweden 68.75
## 179 179 Tampa, FL, United States 68.61
## 180 180 Regina, Canada 68.46
## 181 181 Mannheim, Germany 68.35
## 182 182 Leeds, United Kingdom 68.26
## 183 183 Virginia Beach, VA, United States 67.86
## 184 184 Berlin, Germany 67.75
## 185 185 Lille, France 67.73
## 186 186 Syracuse, NY, United States 67.55
## 187 187 Stuttgart, Germany 67.46
## 188 188 Coquitlam, Canada 67.43
## 189 189 Red Deer, Canada 67.42
## 190 190 Cologne, Germany 67.36
## 191 191 Aachen, Germany 67.33
## 192 192 Tallahassee, FL, United States 67.24
## 193 193 Bakersfield, CA, United States 67.11
## 194 194 Ann Arbor, MI, United States 67.06
## 195 195 Nottingham, United Kingdom 67.05
## 196 196 Edmonton, Canada 67.03
## 197 197 Las Vegas, NV, United States 66.98
## 198 198 Columbus, OH, United States 66.90
## 199 199 Turin, Italy 66.68
## 200 200 Spokane, WA, United States 66.60
## 201 201 Kelowna, Canada 66.60
## 202 202 Exeter, United Kingdom 66.56
## 203 203 Glasgow, United Kingdom 66.50
## 204 204 Memphis, TN, United States 66.49
## 205 205 Kingston, Canada 66.45
## 206 206 Nuremberg, Germany 66.44
## 207 207 Coventry, United Kingdom 66.31
## 208 208 Columbia, SC, United States 66.23
## 209 209 Victoria, Canada 66.17
## 210 210 Malmo, Sweden 66.14
## 211 211 Salem, OR, United States 66.04
## 212 212 Leipzig, Germany 66.04
## 213 213 Dresden, Germany 65.92
## 214 214 Fort Wayne, IN, United States 65.88
## 215 215 Dayton, OH, United States 65.84
## 216 216 San Juan, Puerto Rico 65.79
## 217 217 Taipei, Taiwan 65.75
## 218 218 Kansas City, MO, United States 65.74
## 219 219 Leicester, United Kingdom 65.59
## 220 220 Oshawa, Canada 65.44
## 221 221 Nanaimo, BC, Canada 65.28
## 222 222 Fort Worth, TX, United States 65.19
## 223 223 Palma de Mallorca, Spain 65.17
## 224 224 Mississauga, Canada 65.08
## 225 225 Quebec City, Canada 65.07
## 226 226 Norwich, United Kingdom 64.95
## 227 227 Burnaby, Canada 64.94
## 228 228 Fayetteville, AR, United States 64.84
## 229 229 Naples, Italy 64.82
## 230 230 Derby, United Kingdom 64.70
## 231 231 Marseille, France 64.64
## 232 232 Kingston, Jamaica 64.59
## 233 233 Hanover, Germany 64.57
## 234 234 Richmond, VA, United States 64.56
## 235 235 Gold Coast, Australia 64.53
## 236 236 Greensboro, NC, United States 64.46
## 237 237 Birmingham, United Kingdom 64.46
## 238 238 Windsor, Canada 64.42
## 239 239 Dallas, TX, United States 64.32
## 240 240 Albuquerque, NM, United States 64.32
## 241 241 Phoenix, AZ, United States 64.31
## 242 242 Southampton, United Kingdom 63.73
## 243 243 Gainesville, FL, United States 63.62
## 244 244 Montreal, Canada 63.52
## 245 245 Grand Rapids, MI, United States 63.47
## 246 246 Tucson, AZ, United States 63.35
## 247 247 Madison, WI, United States 63.30
## 248 248 Chattanooga, TN, United States 63.28
## 249 249 Fresno, CA, United States 63.25
## 250 250 Wichita, KS, United States 63.18
## 251 251 Winnipeg, Canada 63.15
## 252 252 Cagliari, Italy 63.15
## 253 253 Salt Lake City, UT, United States 62.94
## 254 254 Ottawa, Canada 62.88
## 255 255 Doha, Qatar 62.81
## 256 256 Detroit, MI, United States 62.77
## 257 257 Newcastle upon Tyne, United Kingdom 62.76
## 258 258 Tulsa, OK, United States 62.67
## 259 259 Cincinnati, OH, United States 62.65
## 260 260 Sheffield, United Kingdom 62.64
## 261 261 Belfast, United Kingdom 62.42
## 262 262 Lubbock, TX, United States 62.40
## 263 263 Taichung, Taiwan 62.23
## 264 264 Des Moines, IA, United States 62.21
## 265 265 Houston, TX, United States 62.16
## 266 266 Barcelona, Spain 62.15
## 267 267 Cardiff, United Kingdom 62.12
## 268 268 Liverpool, United Kingdom 62.00
## 269 269 Abu Dhabi, United Arab Emirates 61.94
## 270 270 Oklahoma City, OK, United States 61.72
## 271 271 Palermo, Italy 61.16
## 272 272 Moncton, Canada 61.15
## 273 273 Nicosia, Cyprus 60.97
## 274 274 Knoxville, TN, United States 60.97
## 275 275 Beirut, Lebanon 60.79
## 276 276 Hamilton, Canada 60.75
## 277 277 Springfield, MO, United States 60.56
## 278 278 Vancouver, WA, United States 60.46
## 279 279 Athens, Greece 60.44
## 280 280 Toledo, OH, United States 60.35
## 281 281 Little Rock, AR, United States 60.31
## 282 282 Louisville, KY, United States 60.24
## 283 283 Madrid, Spain 60.12
## 284 284 Reno, NV, United States 59.84
## 285 285 Huntsville, AL, United States 59.80
## 286 286 Lexington, KY, United States 59.64
## 287 287 Port of Spain, Trinidad And Tobago 59.60
## 288 288 Boise, ID, United States 59.43
## 289 289 El Paso, TX, United States 59.37
## 290 290 Surrey, Canada 59.18
## 291 291 London, Canada 59.15
## 292 292 Abbotsford, Canada 58.95
## 293 293 Kitchener, Canada 58.93
## 294 294 San Antonio, TX, United States 58.12
## 295 295 Montevideo, Uruguay 58.05
## 296 296 Zaragoza (Saragossa), Spain 58.00
## 297 297 Thessaloniki, Greece 57.97
## 298 298 San Jose, Costa Rica 57.84
## 299 299 Limassol, Cyprus 57.71
## 300 300 Accra, Ghana 57.23
## 301 301 Kaohsiung, Taiwan 56.44
## 302 302 Ljubljana, Slovenia 56.34
## 303 303 Valencia, Spain 55.27
## 304 304 Manama, Bahrain 55.23
## 305 305 Tallinn, Estonia 55.23
## 306 306 Panama City, Panama 54.91
## 307 307 Amman, Jordan 54.72
## 308 308 Seville (Sevilla), Spain 54.70
## 309 309 Larnaca, Cyprus 54.31
## 310 310 Lisbon, Portugal 54.16
## 311 311 Alicante, Spain 53.90
## 312 312 Split, Croatia 53.62
## 313 313 Bangkok, Thailand 53.61
## 314 314 Sharjah, United Arab Emirates 53.45
## 315 315 Dubai, United Arab Emirates 53.32
## 316 316 Rijeka, Croatia 52.96
## 317 317 Zagreb, Croatia 52.20
## 318 318 Makati, Philippines 51.07
## 319 319 Coimbra, Portugal 51.07
## 320 320 Muscat, Oman 51.04
## 321 321 Al Khobar, Saudi Arabia 51.03
## 322 322 Funchal, Portugal 50.90
## 323 323 Riga, Latvia 50.82
## 324 324 Porto, Portugal 50.43
## 325 325 Shanghai, China 50.41
## 326 326 Granada, Spain 50.41
## 327 327 Malaga, Spain 50.38
## 328 328 Santiago, Chile 50.37
## 329 329 Jeddah (Jiddah), Saudi Arabia 49.99
## 330 330 Addis Ababa, Ethiopia 49.96
## 331 331 Tartu, Estonia 49.65
## 332 332 Havana, Cuba 49.52
## 333 333 Quito, Ecuador 49.42
## 334 334 Maribor, Slovenia 49.30
## 335 335 Santa Cruz de Tenerife, Spain 48.69
## 336 336 Riyadh, Saudi Arabia 48.68
## 337 337 Bratislava, Slovakia 48.64
## 338 338 Braga, Portugal 48.55
## 339 339 Ad Dammam, Saudi Arabia 48.43
## 340 340 Vilnius, Lithuania 48.31
## 341 341 Prague, Czech Republic 48.02
## 342 342 Bandar Seri Begawan, Brunei 48.01
## 343 343 Harare, Zimbabwe 47.78
## 344 344 Las Palmas de Gran Canaria, Spain 47.39
## 345 345 San Salvador, El Salvador 47.22
## 346 346 Guayaquil, Ecuador 47.21
## 347 347 Baghdad, Iraq 47.17
## 348 348 Phuket, Thailand 46.98
## 349 349 Klaipeda, Lithuania 46.98
## 350 350 Kosice, Slovakia 46.27
## 351 351 Pretoria, South Africa 45.89
## 352 352 Santo Domingo, Dominican Republic 45.88
## 353 353 Kaunas, Lithuania 45.88
## 354 354 Windhoek, Namibia 45.84
## 355 355 Phnom Penh, Cambodia 45.67
## 356 356 Johannesburg, South Africa 45.51
## 357 357 Osijek, Croatia 44.95
## 358 358 Brno, Czech Republic 44.59
## 359 359 Moscow, Russia 44.54
## 360 360 Selangor, Malaysia 44.53
## 361 361 Campinas, Brazil 44.45
## 362 362 Guatemala City, Guatemala 44.39
## 363 363 Dar es Salaam, Tanzania 44.33
## 364 364 Petaling Jaya, Malaysia 44.31
## 365 365 Sao Paulo, Brazil 44.16
## 366 366 Rio de Janeiro, Brazil 44.12
## 367 367 Brasilia, Brazil 44.02
## 368 368 Penang, Malaysia 43.98
## 369 369 Beijing, China 43.88
## 370 370 Budapest, Hungary 43.74
## 371 371 Gdansk, Poland 42.82
## 372 372 Johor Bahru, Malaysia 42.59
## 373 373 Pattaya, Thailand 42.53
## 374 374 Irbil, Iraq 42.51
## 375 375 Kuala Lumpur, Malaysia 42.44
## 376 376 Warsaw, Poland 42.32
## 377 377 Shenzhen, China 42.21
## 378 378 Kuching, Malaysia 42.15
## 379 379 Kota Kinabalu, Malaysia 42.15
## 380 380 Peterborough, United Kingdom 41.93
## 381 381 Nairobi, Kenya 41.76
## 382 382 Jakarta, Indonesia 41.60
## 383 383 Cape Town, South Africa 41.58
## 384 384 Bali, Indonesia 41.48
## 385 385 Lima, Peru 41.47
## 386 386 Olomouc, Czech Republic 41.27
## 387 387 Gdynia, Poland 41.22
## 388 388 Recife, Brazil 40.67
## 389 389 Porto Alegre, Brazil 40.56
## 390 390 Ostrava, Czech Republic 40.55
## 391 391 Chiang Mai, Thailand 40.53
## 392 392 Belo Horizonte, Brazil 40.48
## 393 393 Durban, South Africa 40.48
## 394 394 Bucharest, Romania 40.39
## 395 395 Sofia, Bulgaria 40.36
## 396 396 Guangzhou, China 40.29
## 397 397 Florianopolis, Brazil 40.26
## 398 398 Belgrade, Serbia 40.10
## 399 399 Wroclaw, Poland 40.00
## 400 400 Podgorica, Montenegro 39.83
## 401 401 Krakow (Cracow), Poland 39.53
## 402 402 Port Elizabeth, South Africa 39.41
## 403 403 Saint Petersburg, Russia 39.25
## 404 404 Sarajevo, Bosnia And Herzegovina 39.25
## 405 405 Varna, Bulgaria 39.13
## 406 406 Poznan, Poland 38.99
## 407 407 Constanta, Romania 38.89
## 408 408 Rabat, Morocco 38.59
## 409 409 Buenos Aires, Argentina 38.57
## 410 410 Bydgoszcz, Poland 38.54
## 411 411 Szeged, Hungary 38.41
## 412 412 Hanoi, Vietnam 38.34
## 413 413 Curitiba, Brazil 38.34
## 414 414 Timisoara, Romania 38.19
## 415 415 Cluj-Napoca, Romania 38.13
## 416 416 Debrecen, Hungary 38.05
## 417 417 Suzhou, China 37.95
## 418 418 Manila, Philippines 37.95
## 419 419 Istanbul, Turkey 37.85
## 420 420 Ho Chi Minh City, Vietnam 37.82
## 421 421 Katowice, Poland 37.48
## 422 422 Szczecin, Poland 37.35
## 423 423 Chelyabinsk, Russia 37.29
## 424 424 Tirana, Albania 37.25
## 425 425 Lodz, Poland 37.13
## 426 426 Brasov, Romania 37.13
## 427 427 Banja Luka, Bosnia And Herzegovina 36.54
## 428 428 Iasi, Romania 36.54
## 429 429 Plovdiv, Bulgaria 36.45
## 430 430 Cebu, Philippines 36.41
## 431 431 Yekaterinburg, Russia 36.41
## 432 432 Burgas, Bulgaria 36.26
## 433 433 Chengdu, China 36.16
## 434 434 Cuenca, Ecuador 36.13
## 435 435 Lublin, Poland 36.12
## 436 436 Colombo, Sri Lanka 36.00
## 437 437 Samara, Russia 35.96
## 438 438 Arad, Romania 35.84
## 439 439 Surabaya, Indonesia 35.72
## 440 440 Casablanca, Morocco 35.68
## 441 441 Sibiu, Romania 35.63
## 442 442 Bandung, Indonesia 35.58
## 443 443 Paramaribo, Suriname 35.45
## 444 444 Kaliningrad, Russia 35.40
## 445 445 Novi Sad, Serbia 35.36
## 446 446 Bogota, Colombia 35.05
## 447 447 Yogyakarta, Indonesia 34.91
## 448 448 Astana, Kazakhstan 34.90
## 449 449 Ankara, Turkey 34.77
## 450 450 Skopje, Macedonia 34.68
## 451 451 Oradea, Romania 34.35
## 452 452 Nis, Serbia 34.20
## 453 453 Tehran, Iran 34.19
## 454 454 Mexico City, Mexico 34.18
## 455 455 Ulaanbaatar, Mongolia 34.16
## 456 456 Monterrey, Mexico 34.12
## 457 457 Minsk, Belarus 34.07
## 458 458 Nizhny Novgorod, Russia 34.04
## 459 459 Barranquilla, Colombia 34.04
## 460 460 Izmir, Turkey 34.03
## 461 461 Medellin, Colombia 33.82
## 462 462 Antalya, Turkey 33.78
## 463 463 Chisinau, Moldova 33.75
## 464 464 Bursa, Turkey 33.72
## 465 465 Kazan, Russia 33.67
## 466 466 Novosibirsk, Russia 33.65
## 467 467 Davao, Philippines 33.57
## 468 468 Asuncion, Paraguay 33.49
## 469 469 Algiers, Algeria 33.44
## 470 470 Lagos, Nigeria 33.33
## 471 471 Dumaguete, Philippines 33.21
## 472 472 Yerevan, Armenia 33.16
## 473 473 Tijuana, Mexico 32.70
## 474 474 Almaty, Kazakhstan 32.51
## 475 475 Rostov-na-donu, Russia 32.40
## 476 476 Krasnodar, Russia 32.37
## 477 477 Kathmandu, Nepal 31.89
## 478 478 Craiova, Romania 31.78
## 479 479 Voronezh, Russia 31.74
## 480 480 Quezon City, Philippines 31.66
## 481 481 Dhaka, Bangladesh 31.57
## 482 482 Kampala, Uganda 31.51
## 483 483 Guadalajara, Mexico 31.46
## 484 484 Cancun, Mexico 31.35
## 485 485 Queretaro, Mexico 31.01
## 486 486 Gurgaon, India 30.71
## 487 487 Cali, Colombia 30.48
## 488 488 Tbilisi, Georgia 30.22
## 489 489 Odessa, Ukraine 30.13
## 490 490 Tashkent, Uzbekistan 29.94
## 491 491 Puerto Vallarta, Mexico 29.82
## 492 492 Kiev, Ukraine 29.42
## 493 493 Baku, Azerbaijan 29.41
## 494 494 Merida, Mexico 29.39
## 495 495 Mumbai, India 29.03
## 496 496 Puebla, Mexico 28.89
## 497 497 Delhi, India 28.67
## 498 498 Noida, India 28.55
## 499 499 Dnipro, Ukraine 27.96
## 500 500 Caracas, Venezuela 27.82
## 501 501 Pune, India 27.41
## 502 502 Lviv, Ukraine 27.24
## 503 503 Ludhiana, India 27.17
## 504 504 Bangalore, India 26.83
## 505 505 Kharkiv, Ukraine 26.71
## 506 506 Tunis, Tunisia 26.53
## 507 507 Pristina, Kosovo (Disputed Territory) 26.24
## 508 508 Chandigarh, India 26.00
## 509 509 Islamabad, Pakistan 25.86
## 510 510 Lahore, Pakistan 25.83
## 511 511 Cairo, Egypt 25.68
## 512 512 Jaipur, India 25.46
## 513 513 Indore, India 25.40
## 514 514 Thane, India 25.31
## 515 515 Chennai, India 25.20
## 516 516 Kolkata, India 24.80
## 517 517 Lucknow (Lakhnau), India 24.75
## 518 518 Goa, India 24.34
## 519 519 Ahmedabad, India 24.24
## 520 520 Alexandria, Egypt 23.92
## 521 521 Karachi, Pakistan 23.90
## 522 522 Sumy, Ukraine 23.84
## 523 523 Surat, India 23.77
## 524 524 Hyderabad, India 23.59
## 525 525 Nagpur, India 22.76
## 526 526 Guwahati, India 22.68
## 527 527 Mysore, India 22.41
## 528 528 Bhubaneswar, India 22.40
## 529 529 Mangalore, India 22.40
## 530 530 Coimbatore, India 22.38
## 531 531 Bhopal, India 22.37
## 532 532 Vadodara, India 22.28
## 533 533 Kochi, India 21.73
## 534 534 Visakhapatnam, India 21.52
## 535 535 Navi Mumbai, India 19.30
## 536 536 Thiruvananthapuram, India 19.26
## Rent.Index Cost.of.Living.Plus.Rent.Index Groceries.Index
## 1 103.03 121.21 126.56
## 2 62.62 97.39 127.35
## 3 46.14 88.66 120.44
## 4 50.35 86.83 116.35
## 5 39.22 80.93 114.54
## 6 69.16 95.06 112.08
## 7 57.40 86.45 98.53
## 8 49.58 82.39 104.85
## 9 38.85 76.85 95.97
## 10 48.58 79.42 93.81
## 11 39.38 72.82 87.02
## 12 100.00 100.00 100.00
## 13 39.87 71.39 82.31
## 14 106.49 101.43 101.93
## 15 63.96 79.63 96.32
## 16 39.45 67.75 96.74
## 17 81.02 85.91 83.16
## 18 70.28 79.87 86.63
## 19 56.69 73.32 84.35
## 20 47.84 68.94 64.59
## 21 46.12 67.58 90.86
## 22 61.31 74.76 70.75
## 23 61.20 74.24 78.24
## 24 64.70 75.66 83.72
## 25 36.41 61.89 81.72
## 26 47.60 67.13 73.77
## 27 23.31 55.32 65.29
## 28 76.39 80.45 81.99
## 29 61.58 73.43 86.08
## 30 24.92 55.09 62.32
## 31 54.65 69.13 62.35
## 32 33.01 58.79 93.57
## 33 31.71 58.16 61.47
## 34 70.30 76.10 57.74
## 35 77.14 79.27 77.54
## 36 35.69 59.34 61.31
## 37 76.09 78.39 75.71
## 38 60.38 70.92 66.82
## 39 60.12 70.73 60.82
## 40 62.58 71.72 68.63
## 41 41.58 61.73 83.41
## 42 31.01 56.48 77.50
## 43 49.35 65.10 74.58
## 44 26.21 54.03 68.46
## 45 34.45 57.65 71.63
## 46 23.34 52.35 73.56
## 47 65.75 72.40 73.87
## 48 27.34 54.02 69.55
## 49 55.18 67.17 74.93
## 50 26.66 53.59 67.39
## 51 70.45 74.25 71.59
## 52 40.57 59.96 62.34
## 53 29.08 54.51 73.87
## 54 55.53 67.01 70.69
## 55 40.18 59.69 64.74
## 56 29.07 54.42 63.10
## 57 53.54 65.98 76.79
## 58 35.79 57.36 58.82
## 59 39.11 58.92 63.73
## 60 42.90 60.67 66.39
## 61 34.34 56.60 60.65
## 62 26.10 52.54 67.34
## 63 37.46 57.92 58.34
## 64 23.03 51.09 66.45
## 65 76.61 76.43 71.10
## 66 41.81 59.87 73.17
## 67 38.23 58.15 71.89
## 68 29.77 54.03 69.04
## 69 57.81 67.30 67.27
## 70 32.03 55.02 63.45
## 71 23.23 50.82 71.92
## 72 68.66 72.29 67.52
## 73 44.29 60.75 69.09
## 74 23.02 50.64 65.79
## 75 20.01 49.17 63.25
## 76 25.78 51.85 57.88
## 77 33.44 55.38 65.24
## 78 25.38 51.45 61.20
## 79 42.40 59.47 72.45
## 80 42.16 59.34 70.55
## 81 78.33 76.44 74.88
## 82 30.67 53.84 61.87
## 83 28.04 52.55 59.51
## 84 33.80 55.26 56.34
## 85 22.37 49.84 68.32
## 86 42.73 59.48 67.10
## 87 34.60 55.60 61.79
## 88 43.44 59.72 72.61
## 89 26.16 51.49 72.37
## 90 38.62 57.36 71.42
## 91 50.67 63.05 69.19
## 92 33.42 54.83 53.99
## 93 24.82 50.76 62.71
## 94 21.80 49.32 70.28
## 95 39.56 57.63 59.19
## 96 32.10 54.10 59.93
## 97 42.89 59.20 68.71
## 98 45.18 60.25 56.28
## 99 31.47 53.75 58.58
## 100 41.21 58.27 67.00
## 101 34.02 54.83 61.77
## 102 37.58 56.51 57.77
## 103 21.74 48.99 60.51
## 104 19.47 47.88 55.23
## 105 41.65 58.33 69.21
## 106 32.42 53.86 64.86
## 107 27.95 51.69 57.21
## 108 32.84 53.99 53.33
## 109 46.18 60.27 68.29
## 110 31.99 53.54 67.23
## 111 34.10 54.49 56.19
## 112 43.84 58.99 54.62
## 113 48.82 61.34 51.41
## 114 35.59 55.01 64.71
## 115 30.44 52.57 78.36
## 116 21.78 48.42 62.75
## 117 28.84 51.72 58.44
## 118 61.06 66.97 64.11
## 119 33.39 53.80 54.27
## 120 35.25 54.68 54.35
## 121 34.17 54.17 68.93
## 122 46.89 60.14 66.94
## 123 54.09 63.53 67.92
## 124 45.24 59.30 70.22
## 125 23.11 48.81 61.23
## 126 34.03 53.96 69.40
## 127 34.99 54.29 53.12
## 128 39.68 56.45 63.85
## 129 37.19 55.27 71.47
## 130 19.64 46.96 64.67
## 131 33.45 53.49 68.78
## 132 37.63 55.43 63.56
## 133 31.44 52.29 51.81
## 134 28.05 50.60 72.43
## 135 32.48 52.70 63.61
## 136 33.51 53.16 53.85
## 137 34.81 53.76 67.20
## 138 33.44 53.08 58.75
## 139 31.36 52.04 69.00
## 140 29.30 51.04 62.31
## 141 40.40 56.28 60.02
## 142 40.59 56.33 66.03
## 143 50.35 60.96 65.81
## 144 39.13 55.63 60.45
## 145 31.96 52.23 71.79
## 146 35.72 53.94 55.05
## 147 30.81 51.58 69.88
## 148 26.28 49.42 61.00
## 149 44.28 57.92 64.15
## 150 38.43 55.15 68.50
## 151 21.81 47.27 60.78
## 152 22.11 47.40 53.18
## 153 20.31 46.49 58.63
## 154 29.46 50.77 49.50
## 155 40.63 56.03 63.26
## 156 30.37 51.17 52.69
## 157 25.55 48.88 68.44
## 158 29.33 50.62 60.31
## 159 28.24 50.05 62.06
## 160 49.26 59.98 66.65
## 161 28.14 49.99 60.78
## 162 36.53 53.93 52.44
## 163 42.42 56.70 52.95
## 164 24.03 47.98 54.96
## 165 28.87 50.18 55.98
## 166 21.71 46.75 52.43
## 167 36.18 53.56 71.88
## 168 27.28 49.32 52.20
## 169 27.95 49.62 64.66
## 170 30.98 51.04 64.58
## 171 36.69 53.72 55.28
## 172 29.42 50.28 65.14
## 173 21.86 46.65 53.13
## 174 29.85 50.43 60.75
## 175 35.57 53.07 63.74
## 176 28.91 49.91 68.60
## 177 49.17 59.50 64.10
## 178 25.43 48.24 58.12
## 179 39.54 54.85 65.38
## 180 28.00 49.31 66.75
## 181 22.17 46.49 52.00
## 182 28.05 49.23 53.36
## 183 35.84 52.70 62.06
## 184 31.64 50.65 52.31
## 185 22.98 46.55 52.70
## 186 33.60 51.48 63.81
## 187 33.30 51.29 49.06
## 188 35.02 52.09 66.05
## 189 23.58 46.66 55.68
## 190 29.64 49.51 51.53
## 191 22.76 46.23 52.03
## 192 26.47 47.94 71.30
## 193 28.95 49.05 63.16
## 194 47.59 57.84 60.70
## 195 23.63 46.50 54.03
## 196 29.22 49.13 60.51
## 197 29.55 49.27 59.56
## 198 36.92 52.71 58.94
## 199 20.97 45.04 52.98
## 200 28.33 48.49 59.19
## 201 33.08 50.73 62.58
## 202 29.55 49.04 48.27
## 203 27.49 48.04 51.88
## 204 26.58 47.60 59.36
## 205 26.88 47.72 64.50
## 206 24.08 46.39 50.10
## 207 26.92 47.66 52.61
## 208 27.73 48.01 65.60
## 209 38.10 52.88 65.05
## 210 26.09 47.18 56.60
## 211 28.93 48.48 61.63
## 212 19.98 44.24 50.44
## 213 21.68 44.98 50.52
## 214 21.74 44.98 70.07
## 215 21.97 45.07 62.60
## 216 24.43 46.21 59.19
## 217 22.74 45.39 73.78
## 218 30.53 49.07 58.43
## 219 22.41 45.15 51.01
## 220 27.37 47.42 55.97
## 221 24.29 45.88 68.45
## 222 35.53 51.15 56.86
## 223 27.12 47.16 50.72
## 224 35.79 51.22 58.39
## 225 16.10 41.89 62.78
## 226 23.69 45.42 48.98
## 227 40.95 53.59 58.52
## 228 25.90 46.41 61.15
## 229 18.34 42.82 56.22
## 230 19.76 43.43 51.11
## 231 23.63 45.23 54.31
## 232 15.89 41.54 64.91
## 233 22.82 44.80 53.06
## 234 35.24 50.68 63.54
## 235 37.37 51.68 59.94
## 236 27.34 46.89 63.03
## 237 30.50 48.38 48.03
## 238 21.98 44.33 51.65
## 239 43.15 54.30 58.50
## 240 27.29 46.79 64.42
## 241 33.65 49.79 56.58
## 242 31.44 48.45 48.32
## 243 29.02 47.24 60.52
## 244 25.25 45.40 60.69
## 245 31.04 48.12 55.26
## 246 23.63 44.55 52.48
## 247 37.52 51.09 56.66
## 248 29.58 47.33 57.19
## 249 30.12 47.57 54.68
## 250 23.45 44.38 57.30
## 251 23.70 44.48 57.33
## 252 19.23 42.36 55.09
## 253 35.80 50.10 55.93
## 254 30.26 47.44 54.70
## 255 56.39 59.77 51.33
## 256 34.22 49.25 56.21
## 257 22.89 43.89 45.04
## 258 26.87 45.72 59.49
## 259 31.03 47.68 52.40
## 260 23.00 43.88 49.09
## 261 22.62 43.58 50.78
## 262 24.28 44.35 56.80
## 263 13.02 38.94 72.88
## 264 33.57 48.66 57.09
## 265 43.11 53.14 54.36
## 266 32.44 48.09 48.06
## 267 28.79 46.34 52.30
## 268 24.72 44.35 44.70
## 269 58.43 60.28 50.11
## 270 25.72 44.68 60.18
## 271 16.75 40.14 50.93
## 272 17.69 40.58 54.08
## 273 17.72 40.50 46.70
## 274 28.75 45.72 59.45
## 275 32.31 47.31 42.01
## 276 26.34 44.46 53.08
## 277 18.66 40.73 60.68
## 278 35.97 48.87 50.54
## 279 12.73 37.85 44.92
## 280 21.26 41.84 50.89
## 281 26.40 44.26 55.44
## 282 26.86 44.44 53.87
## 283 31.59 46.62 45.69
## 284 38.03 49.51 51.96
## 285 28.65 45.06 58.83
## 286 24.86 43.17 54.50
## 287 19.73 40.73 55.83
## 288 30.85 45.90 50.93
## 289 22.16 41.76 54.07
## 290 30.36 45.54 51.61
## 291 23.08 42.08 47.61
## 292 25.01 42.89 54.08
## 293 25.38 43.05 51.13
## 294 31.26 45.41 55.20
## 295 17.98 39.09 44.97
## 296 18.18 39.15 45.42
## 297 11.28 35.86 43.49
## 298 18.15 39.05 54.00
## 299 25.14 42.29 44.64
## 300 36.27 47.31 50.61
## 301 9.66 34.30 63.90
## 302 19.10 38.71 44.61
## 303 19.30 38.24 43.85
## 304 28.59 42.62 47.89
## 305 17.81 37.51 37.57
## 306 30.02 43.13 48.72
## 307 12.29 34.63 43.18
## 308 20.25 38.39 43.86
## 309 11.52 34.06 41.24
## 310 29.92 42.69 42.20
## 311 15.68 35.81 42.74
## 312 13.41 34.59 42.31
## 313 25.72 40.41 52.65
## 314 27.86 41.34 42.29
## 315 49.32 51.42 37.47
## 316 11.34 33.26 41.96
## 317 14.69 34.44 41.94
## 318 23.04 37.80 53.50
## 319 13.59 33.33 40.31
## 320 24.72 38.58 41.46
## 321 14.18 33.58 43.30
## 322 17.76 35.21 38.92
## 323 13.56 33.18 36.36
## 324 21.87 36.91 39.50
## 325 34.08 42.68 51.66
## 326 14.72 33.52 37.44
## 327 20.51 36.24 40.51
## 328 17.21 34.68 40.37
## 329 12.25 32.12 37.48
## 330 28.77 39.93 39.26
## 331 13.67 32.62 37.77
## 332 9.56 30.60 35.26
## 333 14.79 33.03 45.13
## 334 10.80 31.08 38.45
## 335 17.39 33.87 37.32
## 336 14.06 32.30 38.42
## 337 22.28 36.16 39.84
## 338 12.92 31.69 38.22
## 339 12.46 31.40 40.41
## 340 17.05 33.51 35.05
## 341 23.87 36.59 39.22
## 342 24.00 36.64 46.01
## 343 13.31 31.46 40.14
## 344 19.71 34.29 39.00
## 345 15.92 32.40 45.60
## 346 14.87 31.90 39.27
## 347 14.09 31.51 37.22
## 348 15.25 31.96 47.75
## 349 10.79 29.85 36.30
## 350 15.30 31.61 36.56
## 351 13.92 30.75 34.99
## 352 11.73 29.72 35.34
## 353 11.73 29.71 34.52
## 354 20.34 33.77 40.21
## 355 17.63 32.40 45.08
## 356 17.34 32.18 35.68
## 357 7.51 27.23 35.73
## 358 18.20 32.10 36.98
## 359 29.31 37.33 33.29
## 360 8.87 27.65 40.31
## 361 12.25 29.21 30.99
## 362 14.77 30.37 39.08
## 363 22.22 33.87 30.77
## 364 12.11 29.07 48.95
## 365 16.59 31.11 32.25
## 366 16.19 30.89 29.67
## 367 13.90 29.76 34.36
## 368 10.13 27.96 45.30
## 369 31.50 38.02 37.61
## 370 16.04 30.63 33.14
## 371 16.42 30.32 30.83
## 372 9.83 27.09 50.21
## 373 19.18 31.48 43.07
## 374 11.69 27.92 36.73
## 375 16.70 30.25 41.63
## 376 20.60 32.04 31.63
## 377 25.64 34.37 39.71
## 378 5.74 24.92 42.98
## 379 12.08 27.92 42.93
## 380 19.52 31.32 22.53
## 381 13.17 28.23 36.97
## 382 15.80 29.39 41.08
## 383 27.38 34.86 32.79
## 384 8.45 25.84 44.51
## 385 15.51 29.18 36.03
## 386 12.42 27.61 36.53
## 387 13.91 28.29 30.93
## 388 8.17 25.29 30.60
## 389 10.49 26.32 28.08
## 390 9.60 25.90 33.62
## 391 11.04 26.57 46.11
## 392 9.86 25.99 26.77
## 393 13.43 27.67 31.46
## 394 12.86 27.36 30.96
## 395 12.36 27.10 33.08
## 396 18.96 30.19 37.63
## 397 12.08 26.92 28.90
## 398 11.54 26.58 28.17
## 399 17.35 29.27 31.51
## 400 9.68 25.56 29.54
## 401 17.33 29.02 29.92
## 402 11.43 26.17 31.14
## 403 17.55 28.98 30.71
## 404 9.22 25.03 29.94
## 405 8.49 24.63 32.69
## 406 13.25 26.81 30.18
## 407 8.44 24.48 27.69
## 408 13.42 26.67 32.89
## 409 11.75 25.87 29.66
## 410 14.65 27.23 29.79
## 411 9.60 24.77 30.26
## 412 13.06 26.37 35.91
## 413 9.68 24.77 25.26
## 414 10.74 25.20 30.87
## 415 13.27 26.36 31.34
## 416 9.29 24.44 29.62
## 417 15.78 27.45 36.03
## 418 15.80 27.46 31.73
## 419 11.20 25.24 31.34
## 420 16.41 27.69 36.25
## 421 11.36 25.11 27.90
## 422 12.27 25.48 26.88
## 423 7.64 23.25 32.57
## 424 10.18 24.43 28.33
## 425 11.67 25.08 27.34
## 426 10.76 24.65 28.62
## 427 7.47 22.78 28.38
## 428 9.89 23.92 29.24
## 429 7.86 22.92 29.56
## 430 10.52 24.16 34.29
## 431 11.45 24.60 29.43
## 432 7.32 22.56 29.78
## 433 11.63 24.55 33.43
## 434 10.63 24.06 31.13
## 435 17.45 27.28 27.87
## 436 10.87 24.11 37.80
## 437 11.23 24.26 28.06
## 438 8.62 22.96 28.54
## 439 7.03 22.14 38.13
## 440 15.30 26.03 28.81
## 441 8.99 23.02 28.98
## 442 7.38 22.23 37.78
## 443 6.88 21.93 37.34
## 444 7.58 22.23 28.28
## 445 7.06 21.97 26.62
## 446 12.63 24.44 26.09
## 447 7.32 21.85 38.34
## 448 12.00 24.06 27.81
## 449 6.56 21.42 29.59
## 450 9.00 22.52 26.04
## 451 7.01 21.41 27.89
## 452 5.61 20.66 25.56
## 453 18.48 26.75 28.27
## 454 17.94 26.49 29.88
## 455 9.46 22.47 31.33
## 456 11.28 23.31 29.17
## 457 10.95 23.13 26.58
## 458 10.46 22.88 27.39
## 459 9.54 22.44 25.05
## 460 7.94 21.68 28.41
## 461 11.16 23.09 27.87
## 462 6.01 20.64 31.25
## 463 8.66 21.87 25.05
## 464 5.74 20.48 26.98
## 465 11.02 22.95 26.46
## 466 10.85 22.86 28.36
## 467 7.28 21.13 30.27
## 468 10.53 22.62 26.16
## 469 8.93 21.84 33.22
## 470 30.24 31.86 27.68
## 471 7.35 20.97 35.44
## 472 9.67 22.04 25.40
## 473 10.75 22.31 27.50
## 474 11.68 22.65 24.50
## 475 10.43 22.00 24.78
## 476 10.48 22.01 25.66
## 477 5.15 19.23 27.07
## 478 7.23 20.16 25.59
## 479 7.40 20.22 26.77
## 480 8.34 20.62 26.12
## 481 6.03 19.48 28.10
## 482 9.36 21.02 25.60
## 483 9.49 21.06 28.92
## 484 10.30 21.39 26.75
## 485 9.26 20.72 28.38
## 486 9.96 20.89 26.63
## 487 7.55 19.62 24.69
## 488 10.46 20.87 23.36
## 489 10.22 20.70 21.03
## 490 9.43 20.23 24.99
## 491 14.71 22.67 26.85
## 492 14.53 22.37 23.17
## 493 9.30 19.89 24.32
## 494 5.72 18.19 26.53
## 495 20.31 24.90 26.63
## 496 6.88 18.47 24.07
## 497 8.73 19.23 25.80
## 498 6.18 17.96 25.14
## 499 7.41 18.23 20.28
## 500 8.43 18.64 28.40
## 501 7.38 17.93 26.76
## 502 9.92 19.04 21.17
## 503 4.40 16.39 25.51
## 504 8.60 18.20 26.53
## 505 8.80 18.23 19.40
## 506 6.83 17.21 24.26
## 507 8.36 17.78 22.23
## 508 5.70 16.39 25.46
## 509 7.48 17.16 23.37
## 510 5.27 16.10 22.76
## 511 5.24 16.01 21.31
## 512 4.98 15.76 23.87
## 513 4.40 15.46 25.73
## 514 9.89 18.01 24.18
## 515 6.90 16.53 25.91
## 516 6.00 15.90 23.35
## 517 4.44 15.14 23.21
## 518 6.21 15.76 24.63
## 519 5.19 15.22 24.89
## 520 3.67 14.33 21.09
## 521 6.15 15.50 20.89
## 522 3.75 14.33 18.01
## 523 3.78 14.31 23.78
## 524 5.99 15.26 23.02
## 525 4.50 14.12 21.62
## 526 4.04 13.85 22.91
## 527 4.32 13.85 23.87
## 528 4.40 13.88 23.66
## 529 5.05 14.19 22.21
## 530 5.21 14.25 22.45
## 531 3.43 13.41 20.13
## 532 3.78 13.52 22.26
## 533 5.45 14.02 21.93
## 534 4.26 13.35 21.09
## 535 4.70 12.39 19.21
## 536 4.69 12.36 18.14
## Restaurant.Price.Index Local.Purchasing.Power.Index
## 1 151.77 114.19
## 2 127.14 142.39
## 3 129.10 141.48
## 4 122.83 132.58
## 5 114.86 115.48
## 6 119.78 133.47
## 7 127.87 94.21
## 8 120.62 131.26
## 9 134.55 112.62
## 10 114.42 104.30
## 11 116.35 108.19
## 12 100.00 100.00
## 13 120.45 113.08
## 14 94.58 125.95
## 15 86.72 113.58
## 16 78.76 138.38
## 17 95.27 87.05
## 18 86.23 131.53
## 19 82.55 116.47
## 20 113.18 114.05
## 21 73.48 106.06
## 22 99.49 120.25
## 23 82.29 186.00
## 24 80.27 140.00
## 25 54.41 113.09
## 26 88.11 95.38
## 27 112.90 114.26
## 28 87.60 119.03
## 29 81.44 120.46
## 30 97.34 113.36
## 31 87.71 98.88
## 32 50.34 102.63
## 33 95.15 116.80
## 34 91.85 100.22
## 35 78.55 137.74
## 36 94.99 108.83
## 37 83.08 124.57
## 38 59.40 99.15
## 39 87.98 89.32
## 40 69.34 128.25
## 41 72.82 84.71
## 42 77.64 108.77
## 43 74.75 109.34
## 44 79.47 114.89
## 45 78.53 93.47
## 46 72.47 108.39
## 47 73.72 135.16
## 48 72.77 96.07
## 49 77.97 128.82
## 50 80.73 99.34
## 51 81.71 114.51
## 52 85.86 93.67
## 53 83.57 99.44
## 54 78.52 133.70
## 55 85.51 115.83
## 56 88.19 70.47
## 57 68.35 112.76
## 58 84.91 102.30
## 59 84.93 125.69
## 60 65.02 103.52
## 61 85.41 85.39
## 62 77.60 83.45
## 63 88.94 103.12
## 64 74.72 105.57
## 65 83.14 170.91
## 66 78.69 76.97
## 67 66.74 114.28
## 68 84.70 112.81
## 69 81.89 89.99
## 70 87.07 100.24
## 71 60.92 100.33
## 72 91.99 124.41
## 73 77.91 145.88
## 74 75.80 100.44
## 75 77.18 77.62
## 76 88.45 94.77
## 77 79.28 139.93
## 78 86.36 97.30
## 79 85.71 122.77
## 80 82.50 119.13
## 81 54.05 76.49
## 82 71.50 95.54
## 83 80.36 96.92
## 84 84.44 93.41
## 85 46.37 102.10
## 86 70.76 131.85
## 87 81.23 125.99
## 88 73.78 119.38
## 89 65.25 103.89
## 90 71.47 130.05
## 91 71.60 126.03
## 92 81.15 111.02
## 93 70.81 94.37
## 94 81.11 96.78
## 95 84.57 74.87
## 96 72.83 104.75
## 97 77.01 127.77
## 98 80.50 114.57
## 99 90.89 121.22
## 100 86.02 106.74
## 101 75.27 94.56
## 102 74.67 109.85
## 103 72.30 80.96
## 104 86.23 100.60
## 105 76.67 142.25
## 106 72.71 119.67
## 107 90.52 128.24
## 108 67.20 115.58
## 109 75.64 133.75
## 110 68.26 127.17
## 111 83.88 121.84
## 112 86.14 106.28
## 113 77.46 87.88
## 114 78.11 122.21
## 115 67.68 99.50
## 116 71.65 104.62
## 117 81.94 96.13
## 118 79.21 144.91
## 119 79.83 112.68
## 120 70.09 113.28
## 121 71.96 114.33
## 122 73.06 150.38
## 123 76.90 130.34
## 124 74.59 111.58
## 125 71.79 114.79
## 126 69.34 107.87
## 127 74.50 132.91
## 128 64.54 116.39
## 129 70.69 104.81
## 130 71.20 91.24
## 131 77.88 104.54
## 132 79.19 142.12
## 133 87.08 107.73
## 134 61.05 99.86
## 135 67.94 104.56
## 136 66.51 135.30
## 137 71.87 109.93
## 138 80.86 110.16
## 139 67.63 132.56
## 140 72.75 111.16
## 141 78.68 135.82
## 142 72.96 127.77
## 143 78.34 151.25
## 144 69.33 134.54
## 145 39.36 28.32
## 146 82.28 70.43
## 147 71.98 91.12
## 148 70.54 111.52
## 149 67.53 99.45
## 150 69.67 130.10
## 151 64.07 112.89
## 152 81.05 126.99
## 153 71.32 111.90
## 154 81.79 128.46
## 155 70.06 153.77
## 156 80.84 107.70
## 157 63.92 118.14
## 158 75.49 122.33
## 159 69.68 105.12
## 160 67.35 94.65
## 161 67.61 98.85
## 162 87.30 117.20
## 163 78.93 87.36
## 164 78.34 85.60
## 165 78.14 113.55
## 166 74.86 161.95
## 167 66.40 155.96
## 168 67.80 112.56
## 169 76.92 124.03
## 170 62.75 141.64
## 171 78.14 72.99
## 172 71.31 149.05
## 173 67.53 126.88
## 174 71.93 138.51
## 175 71.41 107.87
## 176 58.42 99.86
## 177 76.79 136.29
## 178 76.33 122.17
## 179 72.99 140.97
## 180 59.29 112.05
## 181 66.93 141.04
## 182 80.41 119.62
## 183 71.73 161.28
## 184 58.53 112.36
## 185 66.87 97.87
## 186 68.60 94.96
## 187 64.14 130.11
## 188 58.84 124.45
## 189 65.18 140.16
## 190 66.42 133.27
## 191 59.44 134.85
## 192 59.97 128.82
## 193 70.58 151.58
## 194 58.50 128.99
## 195 66.60 106.22
## 196 69.57 129.45
## 197 72.20 144.40
## 198 66.04 128.77
## 199 72.24 86.70
## 200 68.65 124.45
## 201 61.82 108.98
## 202 78.62 87.24
## 203 75.35 121.47
## 204 70.42 125.07
## 205 60.41 113.98
## 206 66.17 120.91
## 207 68.35 138.99
## 208 67.08 124.84
## 209 59.95 106.89
## 210 72.21 107.14
## 211 63.28 125.24
## 212 57.36 90.74
## 213 56.77 131.77
## 214 63.82 124.37
## 215 64.97 91.21
## 216 56.46 110.36
## 217 32.95 95.59
## 218 68.12 138.60
## 219 71.76 107.34
## 220 68.51 119.92
## 221 58.51 100.45
## 222 70.27 140.43
## 223 66.04 78.81
## 224 60.01 112.72
## 225 60.07 140.18
## 226 76.45 92.06
## 227 59.61 151.02
## 228 67.22 109.58
## 229 59.15 68.80
## 230 67.14 146.98
## 231 63.64 92.65
## 232 41.79 29.03
## 233 60.00 152.96
## 234 62.47 132.62
## 235 64.12 129.83
## 236 61.80 133.53
## 237 80.25 106.94
## 238 68.38 109.87
## 239 68.02 153.42
## 240 63.21 128.27
## 241 72.47 146.15
## 242 70.79 139.02
## 243 58.47 106.34
## 244 61.07 117.12
## 245 71.44 129.66
## 246 63.98 122.68
## 247 65.73 144.61
## 248 60.41 124.02
## 249 76.08 120.12
## 250 64.33 135.99
## 251 58.50 115.79
## 252 64.01 88.55
## 253 66.10 150.76
## 254 62.10 144.70
## 255 61.18 139.76
## 256 51.65 97.41
## 257 70.56 133.83
## 258 62.36 129.54
## 259 63.41 137.31
## 260 71.97 119.46
## 261 77.19 100.69
## 262 64.34 135.19
## 263 28.17 65.41
## 264 63.36 128.68
## 265 72.49 155.88
## 266 60.42 80.46
## 267 67.16 116.48
## 268 67.48 121.31
## 269 63.20 116.42
## 270 56.84 136.21
## 271 59.39 80.13
## 272 60.71 112.73
## 273 70.81 74.05
## 274 59.43 116.61
## 275 64.39 54.43
## 276 62.20 127.16
## 277 61.21 102.88
## 278 61.81 153.07
## 279 62.38 52.48
## 280 55.69 125.57
## 281 63.52 144.07
## 282 66.45 123.93
## 283 64.44 91.36
## 284 62.27 136.81
## 285 60.20 162.04
## 286 60.08 141.91
## 287 53.74 51.20
## 288 63.79 120.44
## 289 59.41 131.70
## 290 57.55 93.91
## 291 63.25 118.79
## 292 59.78 111.27
## 293 58.73 129.74
## 294 52.09 150.96
## 295 56.33 50.08
## 296 55.82 83.22
## 297 58.35 49.84
## 298 50.33 53.97
## 299 61.39 77.56
## 300 35.26 14.15
## 301 25.32 110.16
## 302 50.53 78.01
## 303 52.36 90.32
## 304 54.77 72.63
## 305 60.44 74.16
## 306 56.33 43.49
## 307 53.30 45.41
## 308 53.13 83.49
## 309 61.99 80.84
## 310 48.79 55.01
## 311 53.97 80.73
## 312 50.28 51.11
## 313 29.92 44.50
## 314 40.54 102.11
## 315 54.61 153.68
## 316 42.72 54.56
## 317 43.99 66.88
## 318 26.37 44.96
## 319 39.91 72.57
## 320 53.53 94.38
## 321 35.34 118.44
## 322 37.82 54.47
## 323 47.56 56.56
## 324 42.58 59.38
## 325 38.61 72.16
## 326 51.53 92.40
## 327 53.00 87.90
## 328 50.49 51.83
## 329 34.96 117.30
## 330 25.06 11.84
## 331 44.56 83.33
## 332 28.80 2.24
## 333 37.30 40.02
## 334 41.88 90.05
## 335 53.01 90.92
## 336 34.25 125.38
## 337 42.14 71.93
## 338 34.80 64.30
## 339 32.03 133.28
## 340 48.83 61.08
## 341 37.83 77.71
## 342 33.42 105.16
## 343 34.75 27.70
## 344 47.20 91.00
## 345 35.92 32.08
## 346 36.69 35.23
## 347 40.60 44.10
## 348 28.58 58.71
## 349 43.53 58.45
## 350 34.18 61.88
## 351 42.21 83.65
## 352 43.65 32.05
## 353 41.31 61.43
## 354 43.45 55.74
## 355 25.71 22.53
## 356 42.93 108.84
## 357 33.88 60.74
## 358 32.93 75.09
## 359 48.98 59.51
## 360 25.83 91.05
## 361 42.79 52.58
## 362 34.49 39.76
## 363 32.43 29.36
## 364 22.16 73.49
## 365 38.79 41.16
## 366 40.01 36.57
## 367 42.56 63.24
## 368 24.70 76.04
## 369 35.68 79.45
## 370 35.79 57.49
## 371 38.37 76.20
## 372 23.81 59.51
## 373 27.58 28.42
## 374 30.83 51.76
## 375 25.04 82.84
## 376 39.89 76.34
## 377 29.22 86.03
## 378 18.94 40.85
## 379 22.28 41.36
## 380 42.75 139.17
## 381 35.98 30.62
## 382 24.79 28.95
## 383 43.81 73.59
## 384 24.08 27.20
## 385 31.08 39.34
## 386 30.38 79.20
## 387 38.21 70.10
## 388 32.84 27.96
## 389 32.38 48.63
## 390 30.99 84.10
## 391 20.17 33.13
## 392 33.38 35.94
## 393 40.72 98.98
## 394 39.75 58.57
## 395 32.60 61.94
## 396 27.12 82.93
## 397 36.15 40.22
## 398 35.39 41.02
## 399 34.82 76.70
## 400 34.44 52.16
## 401 33.78 70.68
## 402 36.24 76.26
## 403 40.88 57.01
## 404 29.14 49.70
## 405 34.34 52.57
## 406 33.34 77.35
## 407 38.34 53.50
## 408 26.71 46.21
## 409 37.47 59.76
## 410 30.29 66.32
## 411 28.58 47.26
## 412 21.05 44.08
## 413 32.27 38.94
## 414 35.35 55.46
## 415 33.54 56.94
## 416 30.17 56.37
## 417 30.16 94.00
## 418 24.11 40.04
## 419 27.85 50.13
## 420 19.56 30.36
## 421 32.27 77.78
## 422 30.21 61.98
## 423 35.96 45.00
## 424 31.35 35.89
## 425 31.56 71.81
## 426 32.52 60.25
## 427 23.94 50.19
## 428 32.88 53.70
## 429 30.19 60.20
## 430 21.53 24.37
## 431 32.23 53.01
## 432 30.88 53.02
## 433 28.20 82.62
## 434 25.89 44.63
## 435 28.86 59.11
## 436 21.20 27.54
## 437 40.12 42.96
## 438 28.06 61.04
## 439 16.96 37.81
## 440 28.35 40.76
## 441 29.59 56.52
## 442 15.10 28.81
## 443 28.82 25.91
## 444 36.72 41.50
## 445 27.80 50.21
## 446 27.92 37.44
## 447 13.44 30.83
## 448 37.00 41.22
## 449 25.13 64.55
## 450 28.69 41.45
## 451 26.30 51.30
## 452 29.16 40.99
## 453 29.54 40.89
## 454 30.51 51.40
## 455 24.29 33.64
## 456 33.07 79.87
## 457 38.05 46.29
## 458 34.16 40.78
## 459 24.07 42.73
## 460 23.59 56.87
## 461 24.50 34.02
## 462 27.42 61.79
## 463 30.43 32.92
## 464 21.44 57.91
## 465 39.27 51.62
## 466 31.16 49.09
## 467 20.52 26.40
## 468 26.26 37.30
## 469 21.35 36.42
## 470 27.83 19.41
## 471 16.61 15.06
## 472 33.31 33.43
## 473 30.98 57.98
## 474 31.66 43.40
## 475 33.68 41.38
## 476 31.59 49.19
## 477 20.72 26.48
## 478 24.92 59.11
## 479 29.60 50.01
## 480 17.97 27.91
## 481 20.73 41.15
## 482 25.09 24.38
## 483 28.03 64.69
## 484 31.52 53.68
## 485 27.45 57.83
## 486 27.52 113.89
## 487 23.02 39.31
## 488 29.22 39.57
## 489 25.50 31.26
## 490 21.66 25.17
## 491 29.38 54.23
## 492 23.51 39.37
## 493 31.25 34.29
## 494 24.44 40.29
## 495 26.36 67.69
## 496 24.36 44.80
## 497 25.30 77.75
## 498 24.53 89.48
## 499 24.78 36.44
## 500 23.63 4.18
## 501 22.68 86.55
## 502 20.42 30.39
## 503 21.18 68.43
## 504 18.70 96.51
## 505 21.91 31.62
## 506 15.87 35.51
## 507 21.10 68.94
## 508 19.17 64.37
## 509 19.20 50.11
## 510 23.12 39.75
## 511 23.26 26.31
## 512 18.29 77.10
## 513 15.97 50.73
## 514 20.97 81.00
## 515 15.97 67.87
## 516 21.09 60.41
## 517 19.82 76.50
## 518 20.14 54.97
## 519 17.40 70.18
## 520 19.02 23.06
## 521 18.57 36.66
## 522 15.53 28.43
## 523 17.75 66.45
## 524 17.35 78.00
## 525 16.99 98.45
## 526 13.70 71.26
## 527 13.38 45.78
## 528 13.42 67.00
## 529 15.92 79.58
## 530 14.39 56.46
## 531 15.56 68.22
## 532 14.43 74.59
## 533 12.20 73.42
## 534 17.09 55.47
## 535 12.55 138.06
## 536 11.93 68.15set.seed(450)Basic Visualization of the data and getting acquainted with it
dim(data) #get the dimensiality of dataset## [1] 536 8sapply(data, class) #get the class of the dataset## Rank City
## "integer" "factor"
## Cost.of.Living.Index Rent.Index
## "numeric" "numeric"
## Cost.of.Living.Plus.Rent.Index Groceries.Index
## "numeric" "numeric"
## Restaurant.Price.Index Local.Purchasing.Power.Index
## "numeric" "numeric"levels(data$City) #see all the different factors in the City variable## [1] "Aachen, Germany"
## [2] "Aalborg, Denmark"
## [3] "Abbotsford, Canada"
## [4] "Aberdeen, United Kingdom"
## [5] "Abu Dhabi, United Arab Emirates"
## [6] "Accra, Ghana"
## [7] "Ad Dammam, Saudi Arabia"
## [8] "Addis Ababa, Ethiopia"
## [9] "Adelaide, Australia"
## [10] "Ahmedabad, India"
## [11] "Al Khobar, Saudi Arabia"
## [12] "Albany, NY, United States"
## [13] "Albuquerque, NM, United States"
## [14] "Alexandria, Egypt"
## [15] "Algiers, Algeria"
## [16] "Alicante, Spain"
## [17] "Almaty, Kazakhstan"
## [18] "Amman, Jordan"
## [19] "Amsterdam, Netherlands"
## [20] "Anchorage, AK, United States"
## [21] "Ankara, Turkey"
## [22] "Ann Arbor, MI, United States"
## [23] "Antalya, Turkey"
## [24] "Antwerp, Belgium"
## [25] "Arad, Romania"
## [26] "Arhus, Denmark"
## [27] "Arlington, TX, United States"
## [28] "Asheville, NC, United States"
## [29] "Astana, Kazakhstan"
## [30] "Asuncion, Paraguay"
## [31] "Athens, Greece"
## [32] "Atlanta, GA, United States"
## [33] "Auckland, New Zealand"
## [34] "Austin, TX, United States"
## [35] "Baghdad, Iraq"
## [36] "Bakersfield, CA, United States"
## [37] "Baku, Azerbaijan"
## [38] "Bali, Indonesia"
## [39] "Baltimore, MD, United States"
## [40] "Bandar Seri Begawan, Brunei"
## [41] "Bandung, Indonesia"
## [42] "Bangalore, India"
## [43] "Bangkok, Thailand"
## [44] "Banja Luka, Bosnia And Herzegovina"
## [45] "Barcelona, Spain"
## [46] "Barranquilla, Colombia"
## [47] "Barrie, Canada"
## [48] "Basel, Switzerland"
## [49] "Bath, United Kingdom"
## [50] "Beijing, China"
## [51] "Beirut, Lebanon"
## [52] "Belfast, United Kingdom"
## [53] "Belgrade, Serbia"
## [54] "Bellevue, WA, United States"
## [55] "Bellingham, WA, United States"
## [56] "Belo Horizonte, Brazil"
## [57] "Bergen, Norway"
## [58] "Berkeley, CA, United States"
## [59] "Berlin, Germany"
## [60] "Bern, Switzerland"
## [61] "Bhopal, India"
## [62] "Bhubaneswar, India"
## [63] "Birmingham, AL, United States"
## [64] "Birmingham, United Kingdom"
## [65] "Bogota, Colombia"
## [66] "Boise, ID, United States"
## [67] "Bologna, Italy"
## [68] "Bonn, Germany"
## [69] "Bordeaux, France"
## [70] "Boston, MA, United States"
## [71] "Boulder, CO, United States"
## [72] "Braga, Portugal"
## [73] "Brampton, Canada"
## [74] "Brasilia, Brazil"
## [75] "Brasov, Romania"
## [76] "Bratislava, Slovakia"
## [77] "Bremen, Germany"
## [78] "Brighton, United Kingdom"
## [79] "Brisbane, Australia"
## [80] "Bristol, United Kingdom"
## [81] "Brno, Czech Republic"
## [82] "Brooklyn, NY, United States"
## [83] "Brussels, Belgium"
## [84] "Bucharest, Romania"
## [85] "Budapest, Hungary"
## [86] "Buenos Aires, Argentina"
## [87] "Buffalo, NY, United States"
## [88] "Burgas, Bulgaria"
## [89] "Burlington, Canada"
## [90] "Burlington, VT, United States"
## [91] "Burnaby, Canada"
## [92] "Bursa, Turkey"
## [93] "Bydgoszcz, Poland"
## [94] "Cagliari, Italy"
## [95] "Cairo, Egypt"
## [96] "Calgary, Canada"
## [97] "Cali, Colombia"
## [98] "Cambridge, United Kingdom"
## [99] "Campinas, Brazil"
## [100] "Canberra, Australia"
## [101] "Cancun, Mexico"
## [102] "Cape Town, South Africa"
## [103] "Caracas, Venezuela"
## [104] "Cardiff, United Kingdom"
## [105] "Casablanca, Morocco"
## [106] "Cebu, Philippines"
## [107] "Chandigarh, India"
## [108] "Charleston, SC, United States"
## [109] "Charlotte, NC, United States"
## [110] "Chattanooga, TN, United States"
## [111] "Chelyabinsk, Russia"
## [112] "Chengdu, China"
## [113] "Chennai, India"
## [114] "Chiang Mai, Thailand"
## [115] "Chicago, IL, United States"
## [116] "Chisinau, Moldova"
## [117] "Christchurch, New Zealand"
## [118] "Cincinnati, OH, United States"
## [119] "Cleveland, OH, United States"
## [120] "Cluj-Napoca, Romania"
## [121] "Coimbatore, India"
## [122] "Coimbra, Portugal"
## [123] "Cologne, Germany"
## [124] "Colombo, Sri Lanka"
## [125] "Columbia, SC, United States"
## [126] "Columbus, OH, United States"
## [127] "Constanta, Romania"
## [128] "Copenhagen, Denmark"
## [129] "Coquitlam, Canada"
## [130] "Cork, Ireland"
## [131] "Coventry, United Kingdom"
## [132] "Craiova, Romania"
## [133] "Cuenca, Ecuador"
## [134] "Curitiba, Brazil"
## [135] "Dallas, TX, United States"
## [136] "Dar es Salaam, Tanzania"
## [137] "Darwin, Australia"
## [138] "Davao, Philippines"
## [139] "Dayton, OH, United States"
## [140] "Debrecen, Hungary"
## [141] "Delhi, India"
## [142] "Denver, CO, United States"
## [143] "Derby, United Kingdom"
## [144] "Des Moines, IA, United States"
## [145] "Detroit, MI, United States"
## [146] "Dhaka, Bangladesh"
## [147] "Dnipro, Ukraine"
## [148] "Doha, Qatar"
## [149] "Dresden, Germany"
## [150] "Dubai, United Arab Emirates"
## [151] "Dublin, Ireland"
## [152] "Dumaguete, Philippines"
## [153] "Dunedin, New Zealand"
## [154] "Durban, South Africa"
## [155] "Dusseldorf, Germany"
## [156] "Edinburgh, United Kingdom"
## [157] "Edmonton, Canada"
## [158] "Eindhoven, Netherlands"
## [159] "El Paso, TX, United States"
## [160] "Espoo, Finland"
## [161] "Eugene, OR, United States"
## [162] "Everett, WA, United States"
## [163] "Exeter, United Kingdom"
## [164] "Fayetteville, AR, United States"
## [165] "Florence, Italy"
## [166] "Florianopolis, Brazil"
## [167] "Fort Myers, FL, United States"
## [168] "Fort Wayne, IN, United States"
## [169] "Fort Worth, TX, United States"
## [170] "Frankfurt, Germany"
## [171] "Fresno, CA, United States"
## [172] "Funchal, Portugal"
## [173] "Gainesville, FL, United States"
## [174] "Galway, Ireland"
## [175] "Gdansk, Poland"
## [176] "Gdynia, Poland"
## [177] "Geneva, Switzerland"
## [178] "Genoa, Italy"
## [179] "Gent, Belgium"
## [180] "Glasgow, United Kingdom"
## [181] "Goa, India"
## [182] "Gold Coast, Australia"
## [183] "Gothenburg, Sweden"
## [184] "Granada, Spain"
## [185] "Grand Rapids, MI, United States"
## [186] "Graz, Austria"
## [187] "Greensboro, NC, United States"
## [188] "Grenoble, France"
## [189] "Groningen, Netherlands"
## [190] "Guadalajara, Mexico"
## [191] "Guangzhou, China"
## [192] "Guatemala City, Guatemala"
## [193] "Guayaquil, Ecuador"
## [194] "Gurgaon, India"
## [195] "Guwahati, India"
## [196] "Haifa, Israel"
## [197] "Halifax, Canada"
## [198] "Hamburg, Germany"
## [199] "Hamilton, Bermuda"
## [200] "Hamilton, Canada"
## [201] "Hamilton, New Zealand"
## [202] "Hanoi, Vietnam"
## [203] "Hanover, Germany"
## [204] "Harare, Zimbabwe"
## [205] "Hartford, CT, United States"
## [206] "Havana, Cuba"
## [207] "Heidelberg, Germany"
## [208] "Helsinki, Finland"
## [209] "Ho Chi Minh City, Vietnam"
## [210] "Hobart, Australia"
## [211] "Hong Kong, Hong Kong"
## [212] "Honolulu, HI, United States"
## [213] "Houston, TX, United States"
## [214] "Huntsville, AL, United States"
## [215] "Hyderabad, India"
## [216] "Iasi, Romania"
## [217] "Indianapolis, IN, United States"
## [218] "Indore, India"
## [219] "Innsbruck, Austria"
## [220] "Irbil, Iraq"
## [221] "Irvine, CA, United States"
## [222] "Islamabad, Pakistan"
## [223] "Istanbul, Turkey"
## [224] "Izmir, Turkey"
## [225] "Jacksonville, FL, United States"
## [226] "Jaipur, India"
## [227] "Jakarta, Indonesia"
## [228] "Jeddah (Jiddah), Saudi Arabia"
## [229] "Jersey City, NJ, United States"
## [230] "Jerusalem, Israel"
## [231] "Johannesburg, South Africa"
## [232] "Johor Bahru, Malaysia"
## [233] "Kaliningrad, Russia"
## [234] "Kampala, Uganda"
## [235] "Kansas City, MO, United States"
## [236] "Kaohsiung, Taiwan"
## [237] "Karachi, Pakistan"
## [238] "Karlsruhe, Germany"
## [239] "Kathmandu, Nepal"
## [240] "Katowice, Poland"
## [241] "Kaunas, Lithuania"
## [242] "Kazan, Russia"
## [243] "Kelowna, Canada"
## [244] "Kharkiv, Ukraine"
## [245] "Kiev, Ukraine"
## [246] "Kingston, Canada"
## [247] "Kingston, Jamaica"
## [248] "Kitchener, Canada"
## [249] "Klaipeda, Lithuania"
## [250] "Knoxville, TN, United States"
## [251] "Kochi, India"
## [252] "Kolkata, India"
## [253] "Kosice, Slovakia"
## [254] "Kota Kinabalu, Malaysia"
## [255] "Krakow (Cracow), Poland"
## [256] "Krasnodar, Russia"
## [257] "Kuala Lumpur, Malaysia"
## [258] "Kuching, Malaysia"
## [259] "Lagos, Nigeria"
## [260] "Lahore, Pakistan"
## [261] "Larnaca, Cyprus"
## [262] "Las Palmas de Gran Canaria, Spain"
## [263] "Las Vegas, NV, United States"
## [264] "Lausanne, Switzerland"
## [265] "Leeds, United Kingdom"
## [266] "Leicester, United Kingdom"
## [267] "Leiden, Netherlands"
## [268] "Leipzig, Germany"
## [269] "Leuven, Belgium"
## [270] "Lexington, KY, United States"
## [271] "Lille, France"
## [272] "Lima, Peru"
## [273] "Limassol, Cyprus"
## [274] "Limerick, Ireland"
## [275] "Linz, Austria"
## [276] "Lisbon, Portugal"
## [277] "Little Rock, AR, United States"
## [278] "Liverpool, United Kingdom"
## [279] "Ljubljana, Slovenia"
## [280] "Lodz, Poland"
## [281] "London, Canada"
## [282] "London, United Kingdom"
## [283] "Long Beach, CA, United States"
## [284] "Los Angeles, CA, United States"
## [285] "Louisville, KY, United States"
## [286] "Lubbock, TX, United States"
## [287] "Lublin, Poland"
## [288] "Lucknow (Lakhnau), India"
## [289] "Ludhiana, India"
## [290] "Lugano, Switzerland"
## [291] "Luxembourg, Luxembourg"
## [292] "Lviv, Ukraine"
## [293] "Lyon, France"
## [294] "Maastricht, Netherlands"
## [295] "Madison, WI, United States"
## [296] "Madrid, Spain"
## [297] "Makati, Philippines"
## [298] "Malaga, Spain"
## [299] "Male, Maldives"
## [300] "Malmo, Sweden"
## [301] "Manama, Bahrain"
## [302] "Manchester, United Kingdom"
## [303] "Mangalore, India"
## [304] "Manila, Philippines"
## [305] "Mannheim, Germany"
## [306] "Maribor, Slovenia"
## [307] "Marseille, France"
## [308] "Medellin, Colombia"
## [309] "Melbourne, Australia"
## [310] "Memphis, TN, United States"
## [311] "Merida, Mexico"
## [312] "Mexico City, Mexico"
## [313] "Miami, FL, United States"
## [314] "Milan, Italy"
## [315] "Milton Keynes, United Kingdom"
## [316] "Milwaukee, WI, United States"
## [317] "Minneapolis, MN, United States"
## [318] "Minsk, Belarus"
## [319] "Mississauga, Canada"
## [320] "Moncton, Canada"
## [321] "Monterrey, Mexico"
## [322] "Montevideo, Uruguay"
## [323] "Montpellier, France"
## [324] "Montreal, Canada"
## [325] "Moscow, Russia"
## [326] "Mumbai, India"
## [327] "Munich, Germany"
## [328] "Muscat, Oman"
## [329] "Mysore, India"
## [330] "Nagpur, India"
## [331] "Nairobi, Kenya"
## [332] "Nanaimo, BC, Canada"
## [333] "Nantes, France"
## [334] "Naples, Italy"
## [335] "Nashville, TN, United States"
## [336] "Navi Mumbai, India"
## [337] "New Orleans, LA, United States"
## [338] "New York, NY, United States"
## [339] "Newcastle upon Tyne, United Kingdom"
## [340] "Newcastle, Australia"
## [341] "Nice, France"
## [342] "Nicosia, Cyprus"
## [343] "Nis, Serbia"
## [344] "Nizhny Novgorod, Russia"
## [345] "Noida, India"
## [346] "Norwich, United Kingdom"
## [347] "Nottingham, United Kingdom"
## [348] "Novi Sad, Serbia"
## [349] "Novosibirsk, Russia"
## [350] "Nuremberg, Germany"
## [351] "Oakland, CA, United States"
## [352] "Odense, Denmark"
## [353] "Odessa, Ukraine"
## [354] "Oklahoma City, OK, United States"
## [355] "Olomouc, Czech Republic"
## [356] "Olympia, WA, United States"
## [357] "Oradea, Romania"
## [358] "Orlando, FL, United States"
## [359] "Osaka, Japan"
## [360] "Oshawa, Canada"
## [361] "Osijek, Croatia"
## [362] "Oslo, Norway"
## [363] "Ostrava, Czech Republic"
## [364] "Ottawa, Canada"
## [365] "Oxford, United Kingdom"
## [366] "Padova, Italy"
## [367] "Palermo, Italy"
## [368] "Palma de Mallorca, Spain"
## [369] "Panama City, Panama"
## [370] "Paramaribo, Suriname"
## [371] "Paris, France"
## [372] "Pattaya, Thailand"
## [373] "Penang, Malaysia"
## [374] "Peoria, IL, United States"
## [375] "Perth, Australia"
## [376] "Petaling Jaya, Malaysia"
## [377] "Peterborough, United Kingdom"
## [378] "Philadelphia, PA, United States"
## [379] "Phnom Penh, Cambodia"
## [380] "Phoenix, AZ, United States"
## [381] "Phuket, Thailand"
## [382] "Pittsburgh, PA, United States"
## [383] "Plovdiv, Bulgaria"
## [384] "Plymouth, United Kingdom"
## [385] "Podgorica, Montenegro"
## [386] "Port Elizabeth, South Africa"
## [387] "Port of Spain, Trinidad And Tobago"
## [388] "Portland, ME, United States"
## [389] "Portland, OR, United States"
## [390] "Porto Alegre, Brazil"
## [391] "Porto, Portugal"
## [392] "Portsmouth, United Kingdom"
## [393] "Poznan, Poland"
## [394] "Prague, Czech Republic"
## [395] "Pretoria, South Africa"
## [396] "Pristina, Kosovo (Disputed Territory)"
## [397] "Puebla, Mexico"
## [398] "Puerto Vallarta, Mexico"
## [399] "Pune, India"
## [400] "Quebec City, Canada"
## [401] "Queretaro, Mexico"
## [402] "Quezon City, Philippines"
## [403] "Quito, Ecuador"
## [404] "Rabat, Morocco"
## [405] "Raleigh, NC, United States"
## [406] "Ramat Gan, Israel"
## [407] "Reading, United Kingdom"
## [408] "Recife, Brazil"
## [409] "Red Deer, Canada"
## [410] "Regina, Canada"
## [411] "Reno, NV, United States"
## [412] "Reykjavik, Iceland"
## [413] "Richmond, VA, United States"
## [414] "Riga, Latvia"
## [415] "Rijeka, Croatia"
## [416] "Rio de Janeiro, Brazil"
## [417] "Riyadh, Saudi Arabia"
## [418] "Rochester, NY, United States"
## [419] "Rome, Italy"
## [420] "Rostov-na-donu, Russia"
## [421] "Rotterdam, Netherlands"
## [422] "Sacramento, CA, United States"
## [423] "Saint Louis, MO, United States"
## [424] "Saint Paul, MN, United States"
## [425] "Saint Petersburg, FL, United States"
## [426] "Saint Petersburg, Russia"
## [427] "Salem, OR, United States"
## [428] "Salt Lake City, UT, United States"
## [429] "Samara, Russia"
## [430] "San Antonio, TX, United States"
## [431] "San Diego, CA, United States"
## [432] "San Francisco, CA, United States"
## [433] "San Jose, CA, United States"
## [434] "San Jose, Costa Rica"
## [435] "San Juan, Puerto Rico"
## [436] "San Salvador, El Salvador"
## [437] "Santa Barbara, CA, United States"
## [438] "Santa Cruz de Tenerife, Spain"
## [439] "Santa Rosa, CA, United States"
## [440] "Santiago, Chile"
## [441] "Santo Domingo, Dominican Republic"
## [442] "Sao Paulo, Brazil"
## [443] "Sarajevo, Bosnia And Herzegovina"
## [444] "Saskatoon, Canada"
## [445] "Seattle, WA, United States"
## [446] "Selangor, Malaysia"
## [447] "Seoul, South Korea"
## [448] "Seville (Sevilla), Spain"
## [449] "Shanghai, China"
## [450] "Sharjah, United Arab Emirates"
## [451] "Sheffield, United Kingdom"
## [452] "Shenzhen, China"
## [453] "Sibiu, Romania"
## [454] "Singapore, Singapore"
## [455] "Skopje, Macedonia"
## [456] "Sliema, Malta"
## [457] "Sofia, Bulgaria"
## [458] "Southampton, United Kingdom"
## [459] "Split, Croatia"
## [460] "Spokane, WA, United States"
## [461] "Springfield, MO, United States"
## [462] "St. John's, NL, Canada"
## [463] "Stavanger, Norway"
## [464] "Stockholm, Sweden"
## [465] "Strasbourg, France"
## [466] "Stuttgart, Germany"
## [467] "Sumy, Ukraine"
## [468] "Surabaya, Indonesia"
## [469] "Surat, India"
## [470] "Surrey, Canada"
## [471] "Suzhou, China"
## [472] "Swindon, United Kingdom"
## [473] "Sydney, Australia"
## [474] "Syracuse, NY, United States"
## [475] "Szczecin, Poland"
## [476] "Szeged, Hungary"
## [477] "Tacoma, WA, United States"
## [478] "Taichung, Taiwan"
## [479] "Taipei, Taiwan"
## [480] "Tallahassee, FL, United States"
## [481] "Tallinn, Estonia"
## [482] "Tampa, FL, United States"
## [483] "Tampere, Finland"
## [484] "Tartu, Estonia"
## [485] "Tashkent, Uzbekistan"
## [486] "Tbilisi, Georgia"
## [487] "Tehran, Iran"
## [488] "Tel Aviv-Yafo, Israel"
## [489] "Thane, India"
## [490] "The Hague (Den Haag), Netherlands"
## [491] "Thessaloniki, Greece"
## [492] "Thiruvananthapuram, India"
## [493] "Tijuana, Mexico"
## [494] "Timisoara, Romania"
## [495] "Tirana, Albania"
## [496] "Tokyo, Japan"
## [497] "Toledo, OH, United States"
## [498] "Toronto, Canada"
## [499] "Toulouse, France"
## [500] "Trieste, Italy"
## [501] "Trondheim, Norway"
## [502] "Tucson, AZ, United States"
## [503] "Tulsa, OK, United States"
## [504] "Tunis, Tunisia"
## [505] "Turin, Italy"
## [506] "Turku, Finland"
## [507] "Ulaanbaatar, Mongolia"
## [508] "Uppsala, Sweden"
## [509] "Utrecht, Netherlands"
## [510] "Vadodara, India"
## [511] "Valencia, Spain"
## [512] "Vancouver, Canada"
## [513] "Vancouver, WA, United States"
## [514] "Varna, Bulgaria"
## [515] "Victoria, Canada"
## [516] "Vienna, Austria"
## [517] "Vilnius, Lithuania"
## [518] "Virginia Beach, VA, United States"
## [519] "Visakhapatnam, India"
## [520] "Voronezh, Russia"
## [521] "Warsaw, Poland"
## [522] "Washington, DC, United States"
## [523] "Wellington, New Zealand"
## [524] "West Palm Beach, FL, United States"
## [525] "Wichita, KS, United States"
## [526] "Windhoek, Namibia"
## [527] "Windsor, Canada"
## [528] "Winnipeg, Canada"
## [529] "Wroclaw, Poland"
## [530] "Yekaterinburg, Russia"
## [531] "Yerevan, Armenia"
## [532] "Yogyakarta, Indonesia"
## [533] "York, United Kingdom"
## [534] "Zagreb, Croatia"
## [535] "Zaragoza (Saragossa), Spain"
## [536] "Zurich, Switzerland"summary(data)#get the basic summary of the whole dataset## Rank City
## Min. : 1.0 Aachen, Germany : 1
## 1st Qu.:134.8 Aalborg, Denmark : 1
## Median :268.5 Abbotsford, Canada : 1
## Mean :268.5 Aberdeen, United Kingdom : 1
## 3rd Qu.:402.2 Abu Dhabi, United Arab Emirates: 1
## Max. :536.0 Accra, Ghana : 1
## (Other) :530
## Cost.of.Living.Index Rent.Index Cost.of.Living.Plus.Rent.Index
## Min. : 19.26 Min. : 3.43 Min. : 12.36
## 1st Qu.: 39.37 1st Qu.: 11.69 1st Qu.: 26.65
## Median : 61.97 Median : 23.09 Median : 44.45
## Mean : 57.19 Mean : 25.21 Mean : 42.05
## 3rd Qu.: 70.86 3rd Qu.: 33.44 3rd Qu.: 53.09
## Max. :137.56 Max. :106.49 Max. :121.21
##
## Groceries.Index Restaurant.Price.Index Local.Purchasing.Power.Index
## Min. : 18.01 Min. : 11.93 Min. : 2.24
## 1st Qu.: 31.50 1st Qu.: 31.55 1st Qu.: 56.79
## Median : 51.57 Median : 59.41 Median : 94.11
## Mean : 49.76 Mean : 54.68 Mean : 89.49
## 3rd Qu.: 62.76 3rd Qu.: 72.34 3rd Qu.:119.50
## Max. :127.35 Max. :151.77 Max. :186.00
## Variable Selection with Linear Regression Analysis
#we will perform a linear regression to predict rank based on all other variables
#We just have to get rid of the numerical predictor ()
CL=data.frame(data$Rank,data$Cost.of.Living.Index,data$Rent.Index,data$Cost.of.Living.Plus.Rent.Index,data$Groceries.Index,data$Restaurant.Price.Index,data$Local.Purchasing.Power.Index)
head(CL)## data.Rank data.Cost.of.Living.Index data.Rent.Index
## 1 1 137.56 103.03
## 2 2 128.65 62.62
## 3 3 126.89 46.14
## 4 4 119.62 50.35
## 5 5 118.42 39.22
## 6 6 118.33 69.16
## data.Cost.of.Living.Plus.Rent.Index data.Groceries.Index
## 1 121.21 126.56
## 2 97.39 127.35
## 3 88.66 120.44
## 4 86.83 116.35
## 5 80.93 114.54
## 6 95.06 112.08
## data.Restaurant.Price.Index data.Local.Purchasing.Power.Index
## 1 151.77 114.19
## 2 127.14 142.39
## 3 129.10 141.48
## 4 122.83 132.58
## 5 114.86 115.48
## 6 119.78 133.47lm<- lm(Rank ~ ., data=CL)
summary(lm)## Warning in summary.lm(lm): essentially perfect fit: summary may be
## unreliable##
## Call:
## lm(formula = Rank ~ ., data = CL)
##
## Residuals:
## Min 1Q Median 3Q Max
## -1.792e-13 -1.077e-14 -2.080e-15 9.100e-15 1.061e-12
##
## Coefficients:
## Estimate Std. Error t value
## (Intercept) -2.357e-13 3.979e-14 -5.923e+00
## data.Rank 1.000e+00 5.520e-17 1.812e+16
## data.Cost.of.Living.Index 4.260e-13 3.204e-13 1.330e+00
## data.Rent.Index 3.804e-13 2.880e-13 1.321e+00
## data.Cost.of.Living.Plus.Rent.Index -8.039e-13 6.084e-13 -1.321e+00
## data.Groceries.Index 4.225e-16 4.815e-16 8.770e-01
## data.Restaurant.Price.Index -1.969e-16 3.409e-16 -5.780e-01
## data.Local.Purchasing.Power.Index -4.706e-18 8.500e-17 -5.500e-02
## Pr(>|t|)
## (Intercept) 5.69e-09 ***
## data.Rank < 2e-16 ***
## data.Cost.of.Living.Index 0.184
## data.Rent.Index 0.187
## data.Cost.of.Living.Plus.Rent.Index 0.187
## data.Groceries.Index 0.381
## data.Restaurant.Price.Index 0.564
## data.Local.Purchasing.Power.Index 0.956
## ---
## Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
##
## Residual standard error: 5.033e-14 on 528 degrees of freedom
## Multiple R-squared: 1, Adjusted R-squared: 1
## F-statistic: 7.237e+32 on 7 and 528 DF, p-value: < 2.2e-16This won’t tell us too much with all the predictors (some of which may be not significant predictors)
We will backward selection manually using alpha = 0.05 as a threshold. We will go one-by-one removing all the predictors with p-values > 0.05.
summary(lm(Rank ~ ., data=CL))## Warning in summary.lm(lm(Rank ~ ., data = CL)): essentially perfect fit:
## summary may be unreliable##
## Call:
## lm(formula = Rank ~ ., data = CL)
##
## Residuals:
## Min 1Q Median 3Q Max
## -1.792e-13 -1.077e-14 -2.080e-15 9.100e-15 1.061e-12
##
## Coefficients:
## Estimate Std. Error t value
## (Intercept) -2.357e-13 3.979e-14 -5.923e+00
## data.Rank 1.000e+00 5.520e-17 1.812e+16
## data.Cost.of.Living.Index 4.260e-13 3.204e-13 1.330e+00
## data.Rent.Index 3.804e-13 2.880e-13 1.321e+00
## data.Cost.of.Living.Plus.Rent.Index -8.039e-13 6.084e-13 -1.321e+00
## data.Groceries.Index 4.225e-16 4.815e-16 8.770e-01
## data.Restaurant.Price.Index -1.969e-16 3.409e-16 -5.780e-01
## data.Local.Purchasing.Power.Index -4.706e-18 8.500e-17 -5.500e-02
## Pr(>|t|)
## (Intercept) 5.69e-09 ***
## data.Rank < 2e-16 ***
## data.Cost.of.Living.Index 0.184
## data.Rent.Index 0.187
## data.Cost.of.Living.Plus.Rent.Index 0.187
## data.Groceries.Index 0.381
## data.Restaurant.Price.Index 0.564
## data.Local.Purchasing.Power.Index 0.956
## ---
## Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
##
## Residual standard error: 5.033e-14 on 528 degrees of freedom
## Multiple R-squared: 1, Adjusted R-squared: 1
## F-statistic: 7.237e+32 on 7 and 528 DF, p-value: < 2.2e-16# The predictor with the greatest p-value is Local Purchasing Power Index (with a p-value of 0.956), so we will remove that one
summary(lm(Rank ~ CL$data.Cost.of.Living.Index+CL$data.Rent.Index+CL$data.Cost.of.Living.Plus.Rent.Index+CL$data.Groceries.Index+CL$data.Restaurant.Price.Index, data=CL))##
## Call:
## lm(formula = Rank ~ CL$data.Cost.of.Living.Index + CL$data.Rent.Index +
## CL$data.Cost.of.Living.Plus.Rent.Index + CL$data.Groceries.Index +
## CL$data.Restaurant.Price.Index, data = CL)
##
## Residuals:
## Min 1Q Median 3Q Max
## -78.47 -19.63 3.21 16.34 346.69
##
## Coefficients:
## Estimate Std. Error t value
## (Intercept) 693.6673 6.8777 100.858
## CL$data.Cost.of.Living.Index 77.7586 253.8245 0.306
## CL$data.Rent.Index 76.6571 228.1565 0.336
## CL$data.Cost.of.Living.Plus.Rent.Index -163.4072 482.0143 -0.339
## CL$data.Groceries.Index 1.1048 0.3725 2.966
## CL$data.Restaurant.Price.Index 0.2171 0.2592 0.838
## Pr(>|t|)
## (Intercept) < 2e-16 ***
## CL$data.Cost.of.Living.Index 0.75946
## CL$data.Rent.Index 0.73702
## CL$data.Cost.of.Living.Plus.Rent.Index 0.73474
## CL$data.Groceries.Index 0.00315 **
## CL$data.Restaurant.Price.Index 0.40256
## ---
## Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
##
## Residual standard error: 39.9 on 530 degrees of freedom
## Multiple R-squared: 0.9342, Adjusted R-squared: 0.9336
## F-statistic: 1506 on 5 and 530 DF, p-value: < 2.2e-16# The remaining predictor with the greatest p-value is Cost of Living Index (with a p-value of 0.75946), so we will remove that one.
#This is interesting as one would assume cost of living would be highly related to the rank of the city.
summary(lm(Rank ~ CL$data.Rent.Index+CL$data.Cost.of.Living.Plus.Rent.Index+CL$data.Groceries.Index+CL$data.Restaurant.Price.Index, data=CL))##
## Call:
## lm(formula = Rank ~ CL$data.Rent.Index + CL$data.Cost.of.Living.Plus.Rent.Index +
## CL$data.Groceries.Index + CL$data.Restaurant.Price.Index,
## data = CL)
##
## Residuals:
## Min 1Q Median 3Q Max
## -78.23 -19.37 3.10 16.21 347.22
##
## Coefficients:
## Estimate Std. Error t value
## (Intercept) 693.6202 6.8701 100.963
## CL$data.Rent.Index 6.7621 0.5432 12.450
## CL$data.Cost.of.Living.Plus.Rent.Index -15.7435 1.0769 -14.619
## CL$data.Groceries.Index 1.0953 0.3709 2.953
## CL$data.Restaurant.Price.Index 0.2182 0.2589 0.843
## Pr(>|t|)
## (Intercept) < 2e-16 ***
## CL$data.Rent.Index < 2e-16 ***
## CL$data.Cost.of.Living.Plus.Rent.Index < 2e-16 ***
## CL$data.Groceries.Index 0.00328 **
## CL$data.Restaurant.Price.Index 0.39982
## ---
## Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
##
## Residual standard error: 39.87 on 531 degrees of freedom
## Multiple R-squared: 0.9342, Adjusted R-squared: 0.9337
## F-statistic: 1886 on 4 and 531 DF, p-value: < 2.2e-16# The remaining predictor with the greatest p-value is Restaurant Price Index (with a p-value of 0.39982), so we will remove that one
summary(lm(Rank ~ CL$data.Rent.Index+CL$data.Cost.of.Living.Plus.Rent.Index+CL$data.Groceries.Index, data=CL))##
## Call:
## lm(formula = Rank ~ CL$data.Rent.Index + CL$data.Cost.of.Living.Plus.Rent.Index +
## CL$data.Groceries.Index, data = CL)
##
## Residuals:
## Min 1Q Median 3Q Max
## -78.20 -18.41 2.91 16.44 347.39
##
## Coefficients:
## Estimate Std. Error t value
## (Intercept) 690.4663 5.7593 119.89
## CL$data.Rent.Index 6.4237 0.3657 17.57
## CL$data.Cost.of.Living.Plus.Rent.Index -14.9792 0.5803 -25.81
## CL$data.Groceries.Index 0.9240 0.3101 2.98
## Pr(>|t|)
## (Intercept) < 2e-16 ***
## CL$data.Rent.Index < 2e-16 ***
## CL$data.Cost.of.Living.Plus.Rent.Index < 2e-16 ***
## CL$data.Groceries.Index 0.00302 **
## ---
## Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
##
## Residual standard error: 39.85 on 532 degrees of freedom
## Multiple R-squared: 0.9342, Adjusted R-squared: 0.9338
## F-statistic: 2516 on 3 and 532 DF, p-value: < 2.2e-16#all significant (p-values < 0.05)
finalLinearMod= (lm(Rank ~ CL$data.Rent.Index+CL$data.Cost.of.Living.Plus.Rent.Index+CL$data.Groceries.Index, data=CL))The remaining 3 predictors (Rent Index, Cost of Living Plus Rent Index, Groceries Index), now have p-values < alpha = 0.05, so these predictors will remain in our final linear model.
To clarify, this analysis was not done to actually predict the rank based on factors (as will be done in the majority of our analyses) but to explore the predictors (Which are significant and which are not? Why might this be the case?)
This process of variable selection helps to show us the most significant predictors in determining Rank of a city (a high rank corresponds to high overall cost to live in that city).
This gives us an equation of the line of Rank= 6.4237Rent.Index - 14.9792Cost.of.Living.Plus.Rent.Index + 0.9240*Groceries.Index + 690.4663
It was unsurprising to see Rent Index was a significant predictor of overall cost of living as rent is the largest expense for most people.
At first, it was surprising that Cost of Living Index (excludes rent) by itself wasn’t a significant predictor of rank. One may think this would be significant, as it seems in direct relation to overall cost to live in that city (and thus, its rank). However, it appears that cost of living index only becomes significant when rent index is considered along with it. This makes sense with the large magnitude of rent - even if other living expenses are cheap, if housing is expensive, the overall price to live will still likely be high (and vice.versa).
Groceries Index is the only non-rent related significant predictor. This is a bit surprising but a potential explanation is certain cities due to isolation from other cities (relatively small islands for example) have very high grocery prices due to shipping costs. These additional costs could be very significant (and has no relation to rent as rent could be low with high grocery prices). To exemplify this, the number 1 ranked city (most expensive to live in overall) has a high Groceries Index of 126.56 (26.56% higher than New York City), and is located on a (relatively) small island.
Overall, this linear regression variable selection gives us an idea on which variables are most significant predictors in determining Rank. This is important for interpretability. It becomes difficult to interpret linear regression (and other methods) when they are many variables (as there may be lots of interaction effect and noise). This interaction effect will be discussed in the multiple linear regression analysis.
Multiple Linear Regression
fit <- lm(data$Rank~data$Cost.of.Living.Index+data$Rent.Index+data$Cost.of.Living.Plus.Rent.Index+data$Groceries.Index+data$Restaurant.Price.Index+data$Local.Purchasing.Power.Index)
summary(fit)##
## Call:
## lm(formula = data$Rank ~ data$Cost.of.Living.Index + data$Rent.Index +
## data$Cost.of.Living.Plus.Rent.Index + data$Groceries.Index +
## data$Restaurant.Price.Index + data$Local.Purchasing.Power.Index)
##
## Residuals:
## Min 1Q Median 3Q Max
## -82.70 -17.50 2.81 15.48 330.46
##
## Coefficients:
## Estimate Std. Error t value Pr(>|t|)
## (Intercept) 700.98819 7.31348 95.849 < 2e-16
## data$Cost.of.Living.Index 53.49352 252.33816 0.212 0.832195
## data$Rent.Index 55.09453 226.81745 0.243 0.808175
## data$Cost.of.Living.Plus.Rent.Index -117.73226 479.18684 -0.246 0.806016
## data$Groceries.Index 1.27808 0.37521 3.406 0.000709
## data$Restaurant.Price.Index 0.42486 0.26790 1.586 0.113354
## data$Local.Purchasing.Power.Index -0.18669 0.06646 -2.809 0.005152
##
## (Intercept) ***
## data$Cost.of.Living.Index
## data$Rent.Index
## data$Cost.of.Living.Plus.Rent.Index
## data$Groceries.Index ***
## data$Restaurant.Price.Index
## data$Local.Purchasing.Power.Index **
## ---
## Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
##
## Residual standard error: 39.64 on 529 degrees of freedom
## Multiple R-squared: 0.9352, Adjusted R-squared: 0.9345
## F-statistic: 1273 on 6 and 529 DF, p-value: < 2.2e-16By performing a Multiple Linear Regression on this dataset, with “Rank” being the response variable, we are able to determine how much of an influence each predictor has on the response variable “Rank”. This measure of significance is expressed in the above summary output of the data where we can see that the “Rank” increases relative to the estimate values for the predictor variables. Using this method of analysis we can determine that, for instance, as the “Cost of Living Index” increases, the rate at which rank will increase by is 53.49352. The influence of the “Rent Index” is also very similar with a estimate of 55.09453. An interesting predictor that has a negative correlation with respect to rank is the “Cost of Living Plus Rent Index” where the rank of the city increases as the predictor decreases at a rate estimate of -117.73226. Lastly the “Groceries Index”, “Restaurant Price Index”, and “Local Purchasing Power Index” predictors are less significant predictors with respect to the ranking of countries compared to the “Cost of Living Index” and “Rent Index”. Therefore, the cost of living index, rank index and cost of living plus rent index have the greatest influence on the rank of the countries within this dataset and are the most significant predictors with respect to the rank of a country. While the remaining predictors are far less significant in comparison. We are able to draw this inference since our Adjusted R-squared is equal to 0.9345 which tells us there is minor variation as the independent variables explain our response variable.
Regression Tree
library(tree)## Warning: package 'tree' was built under R version 3.4.4library(gclus)## Warning: package 'gclus' was built under R version 3.4.4## Loading required package: cluster## Warning: package 'cluster' was built under R version 3.4.4data1 <- data[,-2]
head(data1)## Rank Cost.of.Living.Index Rent.Index Cost.of.Living.Plus.Rent.Index
## 1 1 137.56 103.03 121.21
## 2 2 128.65 62.62 97.39
## 3 3 126.89 46.14 88.66
## 4 4 119.62 50.35 86.83
## 5 5 118.42 39.22 80.93
## 6 6 118.33 69.16 95.06
## Groceries.Index Restaurant.Price.Index Local.Purchasing.Power.Index
## 1 126.56 151.77 114.19
## 2 127.35 127.14 142.39
## 3 120.44 129.10 141.48
## 4 116.35 122.83 132.58
## 5 114.54 114.86 115.48
## 6 112.08 119.78 133.47simtree <- tree(Rank~Cost.of.Living.Index+Rent.Index+Cost.of.Living.Plus.Rent.Index+Groceries.Index+Restaurant.Price.Index+Local.Purchasing.Power.Index,data = data1)
summary(simtree)##
## Regression tree:
## tree(formula = Rank ~ Cost.of.Living.Index + Rent.Index + Cost.of.Living.Plus.Rent.Index +
## Groceries.Index + Restaurant.Price.Index + Local.Purchasing.Power.Index,
## data = data1)
## Variables actually used in tree construction:
## [1] "Cost.of.Living.Index"
## Number of terminal nodes: 8
## Residual mean deviance: 379.7 = 200500 / 528
## Distribution of residuals:
## Min. 1st Qu. Median Mean 3rd Qu. Max.
## -33 -17 0 0 17 33plot(simtree)
text(simtree, pretty=0)
After performing a Regression Tree analysis of the dataset we are presented with the tree above. At first glance we notice that all tree splitting is done with respect to “Cost of Living Index” and this can be because of many things. In this case the splitting happens on this predictor variable due to the fact that it is greatly correlated to the rank of a country. This characteristic was also observed in our Multiple Linear Regression Analysis proving that the “Cost of Living Index” significantly influences a countries given rank. Another noticeable trait is that there is a linear relation such that as the “Cost of Living Index” increases, the rank of a country increasesalong with it. In other words a counrty that is expensive to live in whith respect to taxes, food, rent, etc. will also be a very successful and thriving counrty nonetheless. This may not come off as a surprise, but as a given person within their respective country is spending more than the average person on living costs, their quality of living is often higher than average aswell. Notice that the Regression Tree summary provides us with an absurdly large MSE of 379.7. This is to be expected as we are indeed overfitting the data and also the fact that the rank is greatly influenced by the “Cost of Living Index”. Although this analysis does not help us draw any real inference as to how the other predictor variables affect the rank, we have proved that the “Cost of Living Index” is the most significant.
simtree1 <- tree(Rank~.,data=data1)
summary(simtree1)##
## Regression tree:
## tree(formula = Rank ~ ., data = data1)
## Variables actually used in tree construction:
## [1] "Cost.of.Living.Index"
## Number of terminal nodes: 8
## Residual mean deviance: 379.7 = 200500 / 528
## Distribution of residuals:
## Min. 1st Qu. Median Mean 3rd Qu. Max.
## -33 -17 0 0 17 33plot(simtree1)
text(simtree1, pretty=0) By removing the “Cost of Living Index” from the Regression Tree Analysis we see that the splitting occurs with respect to the “Cost of Living Plus Rent Index”. This proves that the second most significant predictor variable is indeed “Cost of Living Plus Rent Index”. It also becomes evident that as the “Cost of Living Plus Rent Index” increases, the rank decreases, showing that there is a negative correltion between the two variables. This was also determined in the Multiple Linear Regression Analysis and has become solidified as a result of this analysis. Removing a predictor variable has resulted in a larger MSE of 1938 which is also expected.
library(tree)
cvsimtree <- cv.tree(simtree, FUN=prune.tree, K=10)
plot(cvsimtree, type="b")
newtree <- prune.tree(simtree, best=7)
plot(newtree)
text(newtree, pretty=0)
test_predict<-predict(newtree,data1)
mean((data1$Rank-test_predict)^2)## [1] 374KNN-Classification
splitting data
library(caret)## Warning: package 'caret' was built under R version 3.4.4## Loading required package: lattice## Warning: package 'lattice' was built under R version 3.4.4## Loading required package: ggplot2## Warning: package 'ggplot2' was built under R version 3.4.4## Warning in as.POSIXlt.POSIXct(Sys.time()): unknown timezone 'zone/tz/2018i.
## 1.0/zoneinfo/America/Vancouver'train<-createDataPartition(y=data$Rank,p=.7,list=F)
training<-data[train,]
testing<-data[-train,]10 fold cross validation repeated three times
control<-trainControl(method="repeatedcv",number = 10,repeats=3)
knn<-train(Rank~.,data=training,method="knn",trControl=control,preProcess=c("center","scale"),tuneLength=20)## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United States,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySanta Barbara, CA, United
## States, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain#knnlibrary(MLmetrics)##
## Attaching package: 'MLmetrics'## The following objects are masked from 'package:caret':
##
## MAE, RMSE## The following object is masked from 'package:base':
##
## Recallplot(knn)
test<-predict(knn,newdata = testing)
mean((testing$Rank-test)^2)## [1] 565.6455final MSE
all.MSE<-data.frame(MSE=c("793.363","379.7","39.64","1.71","374"),Model=c("knn classification","regression tree","Multiple linear regression","Random Forest","regression tree"))ggplot(data=all.MSE,aes(x=Model,y=MSE)) +
geom_bar(stat="identity")
PCA + K-Means
Cleaning Data for PCA:
data_clean <- data[,-c(1,2)]PCA ANALYSIS + K-MEANS CLUSTERING:
#ALL PRINCIPAL COMPONENTS PRESENT
pComp <- prcomp(as.matrix(data_clean[,-c(2)]), scale = TRUE, center = TRUE)
biplot(pComp, main="PC BiPlot")
plot(pComp, main = "Screeplot A")
plot(pComp, type='l', main = "Screeplot B")
allcomp <- data.frame(pComp$x[,1:5])
plot(allcomp, pch=16, col=rgb(0,0,0,0.5), main="All PC's Projection")
#Kaiser recommends to keep 1 PC
#To keep 95% of the variance keep 2 PC's
#screeplot recommends to keep 2 PC's
#WITH TWO PRINCIPLAL COMPONENTS RETAINED
retainedcomp <- data.frame(pComp$x[,1:2])
plot(retainedcomp, pch=16, col=rgb(0,0,0,0.5), main="Retainded PC1 and PC2 Projection")
summary(pComp)## Importance of components:
## PC1 PC2 PC3 PC4 PC5
## Standard deviation 2.0846 0.67091 0.37487 0.22285 0.11810
## Proportion of Variance 0.8691 0.09002 0.02811 0.00993 0.00279
## Cumulative Proportion 0.8691 0.95917 0.98728 0.99721 1.00000round(pComp$rotation[,1:5],2)## PC1 PC2 PC3 PC4 PC5
## Cost.of.Living.Index -0.47 0.22 -0.02 0.19 -0.83
## Cost.of.Living.Plus.Rent.Index -0.47 0.19 0.06 -0.85 0.12
## Groceries.Index -0.46 0.23 0.64 0.40 0.40
## Restaurant.Price.Index -0.46 0.10 -0.76 0.27 0.37
## Local.Purchasing.Power.Index -0.38 -0.92 0.09 0.00 -0.03#Determining Number of Clusters
withinSumSquares <- (nrow(data_clean)-1)*sum(apply(data_clean,2,var))
for (i in 2:535) withinSumSquares[i] <- sum(kmeans(data_clean,centers=i)$withinss)
plot(1:535, withinSumSquares, type="b", xlab="Number of Clusters", ylab="Within groups sum of squares", main="Within groups sum of squares")
#We should choose k=5 as shown from the Within groups sum of squares plot.
myKmean <- kmeans((retainedcomp), 5)
myKmean## K-means clustering with 5 clusters of sizes 28, 123, 86, 42, 257
##
## Cluster means:
## PC1 PC2
## 1 -4.3675494 0.8380009
## 2 2.3919512 0.4288863
## 3 0.8999329 0.1118262
## 4 2.7691896 -0.6216821
## 5 -1.4226413 -0.2323869
##
## Clustering vector:
## [1] 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 5 5 5 1 1 5 5 5 5 5 1
## [36] 5 1 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
## [71] 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
## [106] 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
## [141] 5 5 5 5 3 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
## [176] 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
## [211] 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 3 5 5 3 5 5 5 5 5 5 5 5 5 5 5 5 5
## [246] 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 3 5 5 3 5 5 5 5 3 5 3 5 3 5 5 5 3 5
## [281] 5 5 5 5 5 5 3 5 5 5 5 5 5 5 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 5
## [316] 3 3 3 3 3 3 3 3 3 3 3 3 3 3 2 3 2 3 3 3 3 3 3 3 3 3 3 2 3 2 2 3 3 3 3
## [351] 3 2 3 3 2 3 2 3 3 3 2 2 2 3 2 2 3 3 3 2 3 3 2 2 3 3 3 2 2 3 2 2 3 2 2
## [386] 3 3 2 2 3 2 2 3 2 2 3 2 2 3 2 2 3 2 2 2 4 2 2 2 2 2 2 2 2 2 2 3 2 2 2
## [421] 4 2 2 2 4 2 2 2 2 2 2 2 4 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 4 2 2 2 2 2 2
## [456] 4 2 2 2 2 2 2 2 4 2 2 2 2 2 2 2 2 2 2 2 2 2 4 2 2 2 2 4 2 2 4 2 2 2 2
## [491] 2 2 2 2 4 2 4 4 2 2 4 2 4 4 2 2 4 4 4 2 2 4 4 4 4 4 4 4 4 2 4 2 4 4 4
## [526] 4 4 4 4 4 4 4 4 4 4 4
##
## Within cluster sum of squares by cluster:
## [1] 61.71396 38.63183 64.07988 16.67210 161.49981
## (between_SS / total_SS = 86.6 %)
##
## Available components:
##
## [1] "cluster" "centers" "totss" "withinss"
## [5] "tot.withinss" "betweenss" "size" "iter"
## [9] "ifault"palette(alpha(brewer.pal(9,'Set1'), 0.5))
plot(allcomp, col=myKmean$cluster, pch=16, main="All PC's K-Means Cluster Projection")
plot(retainedcomp, col=myKmean$cluster, pch=16, main="Retained PC's K-Means Cluster Projection")
# Centers
myKmean$centers## PC1 PC2
## 1 -4.3675494 0.8380009
## 2 2.3919512 0.4288863
## 3 0.8999329 0.1118262
## 4 2.7691896 -0.6216821
## 5 -1.4226413 -0.2323869# Cluster sizes
groups <- data.frame(myKmean$cluster)
table(groups)## groups
## 1 2 3 4 5
## 28 123 86 42 257# Cities by cluster
data[myKmean$cluster==1,]## Rank City Cost.of.Living.Index Rent.Index
## 1 1 Hamilton, Bermuda 137.56 103.03
## 2 2 Zurich, Switzerland 128.65 62.62
## 3 3 Basel, Switzerland 126.89 46.14
## 4 4 Lausanne, Switzerland 119.62 50.35
## 5 5 Bern, Switzerland 118.42 39.22
## 6 6 Geneva, Switzerland 118.33 69.16
## 7 7 Reykjavik, Iceland 112.57 57.40
## 8 8 Lugano, Switzerland 111.88 49.58
## 9 9 Stavanger, Norway 111.00 38.85
## 10 10 Oslo, Norway 107.14 48.58
## 11 11 Bergen, Norway 102.87 39.38
## 12 12 New York, NY, United States 100.00 100.00
## 13 13 Trondheim, Norway 99.73 39.87
## 14 14 San Francisco, CA, United States 96.88 106.49
## 15 15 Honolulu, HI, United States 93.72 63.96
## 16 16 Anchorage, AK, United States 93.19 39.45
## 17 17 Brooklyn, NY, United States 90.31 81.02
## 18 18 Washington, DC, United States 88.50 70.28
## 19 19 Santa Rosa, CA, United States 88.27 56.69
## 20 20 Copenhagen, Denmark 87.91 47.84
## 21 21 Charleston, SC, United States 86.87 46.12
## 22 22 Luxembourg, Luxembourg 86.85 61.31
## 23 23 Bellevue, WA, United States 85.97 61.20
## 24 24 Seattle, WA, United States 85.51 64.70
## 28 28 Berkeley, CA, United States 84.09 76.39
## 29 29 Jersey City, NJ, United States 84.08 61.58
## 35 35 Oakland, CA, United States 81.18 77.14
## 37 37 Boston, MA, United States 80.46 76.09
## Cost.of.Living.Plus.Rent.Index Groceries.Index Restaurant.Price.Index
## 1 121.21 126.56 151.77
## 2 97.39 127.35 127.14
## 3 88.66 120.44 129.10
## 4 86.83 116.35 122.83
## 5 80.93 114.54 114.86
## 6 95.06 112.08 119.78
## 7 86.45 98.53 127.87
## 8 82.39 104.85 120.62
## 9 76.85 95.97 134.55
## 10 79.42 93.81 114.42
## 11 72.82 87.02 116.35
## 12 100.00 100.00 100.00
## 13 71.39 82.31 120.45
## 14 101.43 101.93 94.58
## 15 79.63 96.32 86.72
## 16 67.75 96.74 78.76
## 17 85.91 83.16 95.27
## 18 79.87 86.63 86.23
## 19 73.32 84.35 82.55
## 20 68.94 64.59 113.18
## 21 67.58 90.86 73.48
## 22 74.76 70.75 99.49
## 23 74.24 78.24 82.29
## 24 75.66 83.72 80.27
## 28 80.45 81.99 87.60
## 29 73.43 86.08 81.44
## 35 79.27 77.54 78.55
## 37 78.39 75.71 83.08
## Local.Purchasing.Power.Index
## 1 114.19
## 2 142.39
## 3 141.48
## 4 132.58
## 5 115.48
## 6 133.47
## 7 94.21
## 8 131.26
## 9 112.62
## 10 104.30
## 11 108.19
## 12 100.00
## 13 113.08
## 14 125.95
## 15 113.58
## 16 138.38
## 17 87.05
## 18 131.53
## 19 116.47
## 20 114.05
## 21 106.06
## 22 120.25
## 23 186.00
## 24 140.00
## 28 119.03
## 29 120.46
## 35 137.74
## 37 124.57data[myKmean$cluster==2,]## Rank City Cost.of.Living.Index
## 330 330 Addis Ababa, Ethiopia 49.96
## 332 332 Havana, Cuba 49.52
## 343 343 Harare, Zimbabwe 47.78
## 345 345 San Salvador, El Salvador 47.22
## 346 346 Guayaquil, Ecuador 47.21
## 352 352 Santo Domingo, Dominican Republic 45.88
## 355 355 Phnom Penh, Cambodia 45.67
## 357 357 Osijek, Croatia 44.95
## 361 361 Campinas, Brazil 44.45
## 362 362 Guatemala City, Guatemala 44.39
## 363 363 Dar es Salaam, Tanzania 44.33
## 365 365 Sao Paulo, Brazil 44.16
## 366 366 Rio de Janeiro, Brazil 44.12
## 370 370 Budapest, Hungary 43.74
## 373 373 Pattaya, Thailand 42.53
## 374 374 Irbil, Iraq 42.51
## 378 378 Kuching, Malaysia 42.15
## 379 379 Kota Kinabalu, Malaysia 42.15
## 381 381 Nairobi, Kenya 41.76
## 382 382 Jakarta, Indonesia 41.60
## 384 384 Bali, Indonesia 41.48
## 385 385 Lima, Peru 41.47
## 388 388 Recife, Brazil 40.67
## 389 389 Porto Alegre, Brazil 40.56
## 391 391 Chiang Mai, Thailand 40.53
## 392 392 Belo Horizonte, Brazil 40.48
## 394 394 Bucharest, Romania 40.39
## 395 395 Sofia, Bulgaria 40.36
## 397 397 Florianopolis, Brazil 40.26
## 398 398 Belgrade, Serbia 40.10
## 400 400 Podgorica, Montenegro 39.83
## 401 401 Krakow (Cracow), Poland 39.53
## 403 403 Saint Petersburg, Russia 39.25
## 404 404 Sarajevo, Bosnia And Herzegovina 39.25
## 405 405 Varna, Bulgaria 39.13
## 407 407 Constanta, Romania 38.89
## 408 408 Rabat, Morocco 38.59
## 409 409 Buenos Aires, Argentina 38.57
## 410 410 Bydgoszcz, Poland 38.54
## 411 411 Szeged, Hungary 38.41
## 412 412 Hanoi, Vietnam 38.34
## 413 413 Curitiba, Brazil 38.34
## 414 414 Timisoara, Romania 38.19
## 415 415 Cluj-Napoca, Romania 38.13
## 416 416 Debrecen, Hungary 38.05
## 418 418 Manila, Philippines 37.95
## 419 419 Istanbul, Turkey 37.85
## 420 420 Ho Chi Minh City, Vietnam 37.82
## 422 422 Szczecin, Poland 37.35
## 423 423 Chelyabinsk, Russia 37.29
## 424 424 Tirana, Albania 37.25
## 426 426 Brasov, Romania 37.13
## 427 427 Banja Luka, Bosnia And Herzegovina 36.54
## 428 428 Iasi, Romania 36.54
## 429 429 Plovdiv, Bulgaria 36.45
## 430 430 Cebu, Philippines 36.41
## 431 431 Yekaterinburg, Russia 36.41
## 432 432 Burgas, Bulgaria 36.26
## 434 434 Cuenca, Ecuador 36.13
## 435 435 Lublin, Poland 36.12
## 436 436 Colombo, Sri Lanka 36.00
## 437 437 Samara, Russia 35.96
## 438 438 Arad, Romania 35.84
## 439 439 Surabaya, Indonesia 35.72
## 440 440 Casablanca, Morocco 35.68
## 441 441 Sibiu, Romania 35.63
## 442 442 Bandung, Indonesia 35.58
## 443 443 Paramaribo, Suriname 35.45
## 444 444 Kaliningrad, Russia 35.40
## 445 445 Novi Sad, Serbia 35.36
## 446 446 Bogota, Colombia 35.05
## 447 447 Yogyakarta, Indonesia 34.91
## 448 448 Astana, Kazakhstan 34.90
## 450 450 Skopje, Macedonia 34.68
## 451 451 Oradea, Romania 34.35
## 452 452 Nis, Serbia 34.20
## 453 453 Tehran, Iran 34.19
## 454 454 Mexico City, Mexico 34.18
## 455 455 Ulaanbaatar, Mongolia 34.16
## 457 457 Minsk, Belarus 34.07
## 458 458 Nizhny Novgorod, Russia 34.04
## 459 459 Barranquilla, Colombia 34.04
## 460 460 Izmir, Turkey 34.03
## 461 461 Medellin, Colombia 33.82
## 462 462 Antalya, Turkey 33.78
## 463 463 Chisinau, Moldova 33.75
## 465 465 Kazan, Russia 33.67
## 466 466 Novosibirsk, Russia 33.65
## 467 467 Davao, Philippines 33.57
## 468 468 Asuncion, Paraguay 33.49
## 469 469 Algiers, Algeria 33.44
## 470 470 Lagos, Nigeria 33.33
## 471 471 Dumaguete, Philippines 33.21
## 472 472 Yerevan, Armenia 33.16
## 473 473 Tijuana, Mexico 32.70
## 474 474 Almaty, Kazakhstan 32.51
## 475 475 Rostov-na-donu, Russia 32.40
## 476 476 Krasnodar, Russia 32.37
## 477 477 Kathmandu, Nepal 31.89
## 479 479 Voronezh, Russia 31.74
## 480 480 Quezon City, Philippines 31.66
## 481 481 Dhaka, Bangladesh 31.57
## 482 482 Kampala, Uganda 31.51
## 484 484 Cancun, Mexico 31.35
## 485 485 Queretaro, Mexico 31.01
## 487 487 Cali, Colombia 30.48
## 488 488 Tbilisi, Georgia 30.22
## 489 489 Odessa, Ukraine 30.13
## 490 490 Tashkent, Uzbekistan 29.94
## 491 491 Puerto Vallarta, Mexico 29.82
## 492 492 Kiev, Ukraine 29.42
## 493 493 Baku, Azerbaijan 29.41
## 494 494 Merida, Mexico 29.39
## 496 496 Puebla, Mexico 28.89
## 499 499 Dnipro, Ukraine 27.96
## 500 500 Caracas, Venezuela 27.82
## 502 502 Lviv, Ukraine 27.24
## 505 505 Kharkiv, Ukraine 26.71
## 506 506 Tunis, Tunisia 26.53
## 510 510 Lahore, Pakistan 25.83
## 511 511 Cairo, Egypt 25.68
## 520 520 Alexandria, Egypt 23.92
## 522 522 Sumy, Ukraine 23.84
## Rent.Index Cost.of.Living.Plus.Rent.Index Groceries.Index
## 330 28.77 39.93 39.26
## 332 9.56 30.60 35.26
## 343 13.31 31.46 40.14
## 345 15.92 32.40 45.60
## 346 14.87 31.90 39.27
## 352 11.73 29.72 35.34
## 355 17.63 32.40 45.08
## 357 7.51 27.23 35.73
## 361 12.25 29.21 30.99
## 362 14.77 30.37 39.08
## 363 22.22 33.87 30.77
## 365 16.59 31.11 32.25
## 366 16.19 30.89 29.67
## 370 16.04 30.63 33.14
## 373 19.18 31.48 43.07
## 374 11.69 27.92 36.73
## 378 5.74 24.92 42.98
## 379 12.08 27.92 42.93
## 381 13.17 28.23 36.97
## 382 15.80 29.39 41.08
## 384 8.45 25.84 44.51
## 385 15.51 29.18 36.03
## 388 8.17 25.29 30.60
## 389 10.49 26.32 28.08
## 391 11.04 26.57 46.11
## 392 9.86 25.99 26.77
## 394 12.86 27.36 30.96
## 395 12.36 27.10 33.08
## 397 12.08 26.92 28.90
## 398 11.54 26.58 28.17
## 400 9.68 25.56 29.54
## 401 17.33 29.02 29.92
## 403 17.55 28.98 30.71
## 404 9.22 25.03 29.94
## 405 8.49 24.63 32.69
## 407 8.44 24.48 27.69
## 408 13.42 26.67 32.89
## 409 11.75 25.87 29.66
## 410 14.65 27.23 29.79
## 411 9.60 24.77 30.26
## 412 13.06 26.37 35.91
## 413 9.68 24.77 25.26
## 414 10.74 25.20 30.87
## 415 13.27 26.36 31.34
## 416 9.29 24.44 29.62
## 418 15.80 27.46 31.73
## 419 11.20 25.24 31.34
## 420 16.41 27.69 36.25
## 422 12.27 25.48 26.88
## 423 7.64 23.25 32.57
## 424 10.18 24.43 28.33
## 426 10.76 24.65 28.62
## 427 7.47 22.78 28.38
## 428 9.89 23.92 29.24
## 429 7.86 22.92 29.56
## 430 10.52 24.16 34.29
## 431 11.45 24.60 29.43
## 432 7.32 22.56 29.78
## 434 10.63 24.06 31.13
## 435 17.45 27.28 27.87
## 436 10.87 24.11 37.80
## 437 11.23 24.26 28.06
## 438 8.62 22.96 28.54
## 439 7.03 22.14 38.13
## 440 15.30 26.03 28.81
## 441 8.99 23.02 28.98
## 442 7.38 22.23 37.78
## 443 6.88 21.93 37.34
## 444 7.58 22.23 28.28
## 445 7.06 21.97 26.62
## 446 12.63 24.44 26.09
## 447 7.32 21.85 38.34
## 448 12.00 24.06 27.81
## 450 9.00 22.52 26.04
## 451 7.01 21.41 27.89
## 452 5.61 20.66 25.56
## 453 18.48 26.75 28.27
## 454 17.94 26.49 29.88
## 455 9.46 22.47 31.33
## 457 10.95 23.13 26.58
## 458 10.46 22.88 27.39
## 459 9.54 22.44 25.05
## 460 7.94 21.68 28.41
## 461 11.16 23.09 27.87
## 462 6.01 20.64 31.25
## 463 8.66 21.87 25.05
## 465 11.02 22.95 26.46
## 466 10.85 22.86 28.36
## 467 7.28 21.13 30.27
## 468 10.53 22.62 26.16
## 469 8.93 21.84 33.22
## 470 30.24 31.86 27.68
## 471 7.35 20.97 35.44
## 472 9.67 22.04 25.40
## 473 10.75 22.31 27.50
## 474 11.68 22.65 24.50
## 475 10.43 22.00 24.78
## 476 10.48 22.01 25.66
## 477 5.15 19.23 27.07
## 479 7.40 20.22 26.77
## 480 8.34 20.62 26.12
## 481 6.03 19.48 28.10
## 482 9.36 21.02 25.60
## 484 10.30 21.39 26.75
## 485 9.26 20.72 28.38
## 487 7.55 19.62 24.69
## 488 10.46 20.87 23.36
## 489 10.22 20.70 21.03
## 490 9.43 20.23 24.99
## 491 14.71 22.67 26.85
## 492 14.53 22.37 23.17
## 493 9.30 19.89 24.32
## 494 5.72 18.19 26.53
## 496 6.88 18.47 24.07
## 499 7.41 18.23 20.28
## 500 8.43 18.64 28.40
## 502 9.92 19.04 21.17
## 505 8.80 18.23 19.40
## 506 6.83 17.21 24.26
## 510 5.27 16.10 22.76
## 511 5.24 16.01 21.31
## 520 3.67 14.33 21.09
## 522 3.75 14.33 18.01
## Restaurant.Price.Index Local.Purchasing.Power.Index
## 330 25.06 11.84
## 332 28.80 2.24
## 343 34.75 27.70
## 345 35.92 32.08
## 346 36.69 35.23
## 352 43.65 32.05
## 355 25.71 22.53
## 357 33.88 60.74
## 361 42.79 52.58
## 362 34.49 39.76
## 363 32.43 29.36
## 365 38.79 41.16
## 366 40.01 36.57
## 370 35.79 57.49
## 373 27.58 28.42
## 374 30.83 51.76
## 378 18.94 40.85
## 379 22.28 41.36
## 381 35.98 30.62
## 382 24.79 28.95
## 384 24.08 27.20
## 385 31.08 39.34
## 388 32.84 27.96
## 389 32.38 48.63
## 391 20.17 33.13
## 392 33.38 35.94
## 394 39.75 58.57
## 395 32.60 61.94
## 397 36.15 40.22
## 398 35.39 41.02
## 400 34.44 52.16
## 401 33.78 70.68
## 403 40.88 57.01
## 404 29.14 49.70
## 405 34.34 52.57
## 407 38.34 53.50
## 408 26.71 46.21
## 409 37.47 59.76
## 410 30.29 66.32
## 411 28.58 47.26
## 412 21.05 44.08
## 413 32.27 38.94
## 414 35.35 55.46
## 415 33.54 56.94
## 416 30.17 56.37
## 418 24.11 40.04
## 419 27.85 50.13
## 420 19.56 30.36
## 422 30.21 61.98
## 423 35.96 45.00
## 424 31.35 35.89
## 426 32.52 60.25
## 427 23.94 50.19
## 428 32.88 53.70
## 429 30.19 60.20
## 430 21.53 24.37
## 431 32.23 53.01
## 432 30.88 53.02
## 434 25.89 44.63
## 435 28.86 59.11
## 436 21.20 27.54
## 437 40.12 42.96
## 438 28.06 61.04
## 439 16.96 37.81
## 440 28.35 40.76
## 441 29.59 56.52
## 442 15.10 28.81
## 443 28.82 25.91
## 444 36.72 41.50
## 445 27.80 50.21
## 446 27.92 37.44
## 447 13.44 30.83
## 448 37.00 41.22
## 450 28.69 41.45
## 451 26.30 51.30
## 452 29.16 40.99
## 453 29.54 40.89
## 454 30.51 51.40
## 455 24.29 33.64
## 457 38.05 46.29
## 458 34.16 40.78
## 459 24.07 42.73
## 460 23.59 56.87
## 461 24.50 34.02
## 462 27.42 61.79
## 463 30.43 32.92
## 465 39.27 51.62
## 466 31.16 49.09
## 467 20.52 26.40
## 468 26.26 37.30
## 469 21.35 36.42
## 470 27.83 19.41
## 471 16.61 15.06
## 472 33.31 33.43
## 473 30.98 57.98
## 474 31.66 43.40
## 475 33.68 41.38
## 476 31.59 49.19
## 477 20.72 26.48
## 479 29.60 50.01
## 480 17.97 27.91
## 481 20.73 41.15
## 482 25.09 24.38
## 484 31.52 53.68
## 485 27.45 57.83
## 487 23.02 39.31
## 488 29.22 39.57
## 489 25.50 31.26
## 490 21.66 25.17
## 491 29.38 54.23
## 492 23.51 39.37
## 493 31.25 34.29
## 494 24.44 40.29
## 496 24.36 44.80
## 499 24.78 36.44
## 500 23.63 4.18
## 502 20.42 30.39
## 505 21.91 31.62
## 506 15.87 35.51
## 510 23.12 39.75
## 511 23.26 26.31
## 520 19.02 23.06
## 522 15.53 28.43data[myKmean$cluster==3,]## Rank City Cost.of.Living.Index
## 145 145 Male, Maldives 70.45
## 229 229 Naples, Italy 64.82
## 232 232 Kingston, Jamaica 64.59
## 263 263 Taichung, Taiwan 62.23
## 266 266 Barcelona, Spain 62.15
## 271 271 Palermo, Italy 61.16
## 273 273 Nicosia, Cyprus 60.97
## 275 275 Beirut, Lebanon 60.79
## 279 279 Athens, Greece 60.44
## 287 287 Port of Spain, Trinidad And Tobago 59.60
## 295 295 Montevideo, Uruguay 58.05
## 296 296 Zaragoza (Saragossa), Spain 58.00
## 297 297 Thessaloniki, Greece 57.97
## 298 298 San Jose, Costa Rica 57.84
## 299 299 Limassol, Cyprus 57.71
## 300 300 Accra, Ghana 57.23
## 301 301 Kaohsiung, Taiwan 56.44
## 302 302 Ljubljana, Slovenia 56.34
## 303 303 Valencia, Spain 55.27
## 304 304 Manama, Bahrain 55.23
## 305 305 Tallinn, Estonia 55.23
## 306 306 Panama City, Panama 54.91
## 307 307 Amman, Jordan 54.72
## 308 308 Seville (Sevilla), Spain 54.70
## 309 309 Larnaca, Cyprus 54.31
## 310 310 Lisbon, Portugal 54.16
## 311 311 Alicante, Spain 53.90
## 312 312 Split, Croatia 53.62
## 313 313 Bangkok, Thailand 53.61
## 314 314 Sharjah, United Arab Emirates 53.45
## 316 316 Rijeka, Croatia 52.96
## 317 317 Zagreb, Croatia 52.20
## 318 318 Makati, Philippines 51.07
## 319 319 Coimbra, Portugal 51.07
## 320 320 Muscat, Oman 51.04
## 321 321 Al Khobar, Saudi Arabia 51.03
## 322 322 Funchal, Portugal 50.90
## 323 323 Riga, Latvia 50.82
## 324 324 Porto, Portugal 50.43
## 325 325 Shanghai, China 50.41
## 326 326 Granada, Spain 50.41
## 327 327 Malaga, Spain 50.38
## 328 328 Santiago, Chile 50.37
## 329 329 Jeddah (Jiddah), Saudi Arabia 49.99
## 331 331 Tartu, Estonia 49.65
## 333 333 Quito, Ecuador 49.42
## 334 334 Maribor, Slovenia 49.30
## 335 335 Santa Cruz de Tenerife, Spain 48.69
## 336 336 Riyadh, Saudi Arabia 48.68
## 337 337 Bratislava, Slovakia 48.64
## 338 338 Braga, Portugal 48.55
## 339 339 Ad Dammam, Saudi Arabia 48.43
## 340 340 Vilnius, Lithuania 48.31
## 341 341 Prague, Czech Republic 48.02
## 342 342 Bandar Seri Begawan, Brunei 48.01
## 344 344 Las Palmas de Gran Canaria, Spain 47.39
## 347 347 Baghdad, Iraq 47.17
## 348 348 Phuket, Thailand 46.98
## 349 349 Klaipeda, Lithuania 46.98
## 350 350 Kosice, Slovakia 46.27
## 351 351 Pretoria, South Africa 45.89
## 353 353 Kaunas, Lithuania 45.88
## 354 354 Windhoek, Namibia 45.84
## 356 356 Johannesburg, South Africa 45.51
## 358 358 Brno, Czech Republic 44.59
## 359 359 Moscow, Russia 44.54
## 360 360 Selangor, Malaysia 44.53
## 364 364 Petaling Jaya, Malaysia 44.31
## 367 367 Brasilia, Brazil 44.02
## 368 368 Penang, Malaysia 43.98
## 369 369 Beijing, China 43.88
## 371 371 Gdansk, Poland 42.82
## 372 372 Johor Bahru, Malaysia 42.59
## 375 375 Kuala Lumpur, Malaysia 42.44
## 376 376 Warsaw, Poland 42.32
## 377 377 Shenzhen, China 42.21
## 380 380 Peterborough, United Kingdom 41.93
## 383 383 Cape Town, South Africa 41.58
## 386 386 Olomouc, Czech Republic 41.27
## 387 387 Gdynia, Poland 41.22
## 390 390 Ostrava, Czech Republic 40.55
## 393 393 Durban, South Africa 40.48
## 396 396 Guangzhou, China 40.29
## 399 399 Wroclaw, Poland 40.00
## 402 402 Port Elizabeth, South Africa 39.41
## 417 417 Suzhou, China 37.95
## Rent.Index Cost.of.Living.Plus.Rent.Index Groceries.Index
## 145 31.96 52.23 71.79
## 229 18.34 42.82 56.22
## 232 15.89 41.54 64.91
## 263 13.02 38.94 72.88
## 266 32.44 48.09 48.06
## 271 16.75 40.14 50.93
## 273 17.72 40.50 46.70
## 275 32.31 47.31 42.01
## 279 12.73 37.85 44.92
## 287 19.73 40.73 55.83
## 295 17.98 39.09 44.97
## 296 18.18 39.15 45.42
## 297 11.28 35.86 43.49
## 298 18.15 39.05 54.00
## 299 25.14 42.29 44.64
## 300 36.27 47.31 50.61
## 301 9.66 34.30 63.90
## 302 19.10 38.71 44.61
## 303 19.30 38.24 43.85
## 304 28.59 42.62 47.89
## 305 17.81 37.51 37.57
## 306 30.02 43.13 48.72
## 307 12.29 34.63 43.18
## 308 20.25 38.39 43.86
## 309 11.52 34.06 41.24
## 310 29.92 42.69 42.20
## 311 15.68 35.81 42.74
## 312 13.41 34.59 42.31
## 313 25.72 40.41 52.65
## 314 27.86 41.34 42.29
## 316 11.34 33.26 41.96
## 317 14.69 34.44 41.94
## 318 23.04 37.80 53.50
## 319 13.59 33.33 40.31
## 320 24.72 38.58 41.46
## 321 14.18 33.58 43.30
## 322 17.76 35.21 38.92
## 323 13.56 33.18 36.36
## 324 21.87 36.91 39.50
## 325 34.08 42.68 51.66
## 326 14.72 33.52 37.44
## 327 20.51 36.24 40.51
## 328 17.21 34.68 40.37
## 329 12.25 32.12 37.48
## 331 13.67 32.62 37.77
## 333 14.79 33.03 45.13
## 334 10.80 31.08 38.45
## 335 17.39 33.87 37.32
## 336 14.06 32.30 38.42
## 337 22.28 36.16 39.84
## 338 12.92 31.69 38.22
## 339 12.46 31.40 40.41
## 340 17.05 33.51 35.05
## 341 23.87 36.59 39.22
## 342 24.00 36.64 46.01
## 344 19.71 34.29 39.00
## 347 14.09 31.51 37.22
## 348 15.25 31.96 47.75
## 349 10.79 29.85 36.30
## 350 15.30 31.61 36.56
## 351 13.92 30.75 34.99
## 353 11.73 29.71 34.52
## 354 20.34 33.77 40.21
## 356 17.34 32.18 35.68
## 358 18.20 32.10 36.98
## 359 29.31 37.33 33.29
## 360 8.87 27.65 40.31
## 364 12.11 29.07 48.95
## 367 13.90 29.76 34.36
## 368 10.13 27.96 45.30
## 369 31.50 38.02 37.61
## 371 16.42 30.32 30.83
## 372 9.83 27.09 50.21
## 375 16.70 30.25 41.63
## 376 20.60 32.04 31.63
## 377 25.64 34.37 39.71
## 380 19.52 31.32 22.53
## 383 27.38 34.86 32.79
## 386 12.42 27.61 36.53
## 387 13.91 28.29 30.93
## 390 9.60 25.90 33.62
## 393 13.43 27.67 31.46
## 396 18.96 30.19 37.63
## 399 17.35 29.27 31.51
## 402 11.43 26.17 31.14
## 417 15.78 27.45 36.03
## Restaurant.Price.Index Local.Purchasing.Power.Index
## 145 39.36 28.32
## 229 59.15 68.80
## 232 41.79 29.03
## 263 28.17 65.41
## 266 60.42 80.46
## 271 59.39 80.13
## 273 70.81 74.05
## 275 64.39 54.43
## 279 62.38 52.48
## 287 53.74 51.20
## 295 56.33 50.08
## 296 55.82 83.22
## 297 58.35 49.84
## 298 50.33 53.97
## 299 61.39 77.56
## 300 35.26 14.15
## 301 25.32 110.16
## 302 50.53 78.01
## 303 52.36 90.32
## 304 54.77 72.63
## 305 60.44 74.16
## 306 56.33 43.49
## 307 53.30 45.41
## 308 53.13 83.49
## 309 61.99 80.84
## 310 48.79 55.01
## 311 53.97 80.73
## 312 50.28 51.11
## 313 29.92 44.50
## 314 40.54 102.11
## 316 42.72 54.56
## 317 43.99 66.88
## 318 26.37 44.96
## 319 39.91 72.57
## 320 53.53 94.38
## 321 35.34 118.44
## 322 37.82 54.47
## 323 47.56 56.56
## 324 42.58 59.38
## 325 38.61 72.16
## 326 51.53 92.40
## 327 53.00 87.90
## 328 50.49 51.83
## 329 34.96 117.30
## 331 44.56 83.33
## 333 37.30 40.02
## 334 41.88 90.05
## 335 53.01 90.92
## 336 34.25 125.38
## 337 42.14 71.93
## 338 34.80 64.30
## 339 32.03 133.28
## 340 48.83 61.08
## 341 37.83 77.71
## 342 33.42 105.16
## 344 47.20 91.00
## 347 40.60 44.10
## 348 28.58 58.71
## 349 43.53 58.45
## 350 34.18 61.88
## 351 42.21 83.65
## 353 41.31 61.43
## 354 43.45 55.74
## 356 42.93 108.84
## 358 32.93 75.09
## 359 48.98 59.51
## 360 25.83 91.05
## 364 22.16 73.49
## 367 42.56 63.24
## 368 24.70 76.04
## 369 35.68 79.45
## 371 38.37 76.20
## 372 23.81 59.51
## 375 25.04 82.84
## 376 39.89 76.34
## 377 29.22 86.03
## 380 42.75 139.17
## 383 43.81 73.59
## 386 30.38 79.20
## 387 38.21 70.10
## 390 30.99 84.10
## 393 40.72 98.98
## 396 27.12 82.93
## 399 34.82 76.70
## 402 36.24 76.26
## 417 30.16 94.00data[myKmean$cluster==4,]## Rank City Cost.of.Living.Index
## 406 406 Poznan, Poland 38.99
## 421 421 Katowice, Poland 37.48
## 425 425 Lodz, Poland 37.13
## 433 433 Chengdu, China 36.16
## 449 449 Ankara, Turkey 34.77
## 456 456 Monterrey, Mexico 34.12
## 464 464 Bursa, Turkey 33.72
## 478 478 Craiova, Romania 31.78
## 483 483 Guadalajara, Mexico 31.46
## 486 486 Gurgaon, India 30.71
## 495 495 Mumbai, India 29.03
## 497 497 Delhi, India 28.67
## 498 498 Noida, India 28.55
## 501 501 Pune, India 27.41
## 503 503 Ludhiana, India 27.17
## 504 504 Bangalore, India 26.83
## 507 507 Pristina, Kosovo (Disputed Territory) 26.24
## 508 508 Chandigarh, India 26.00
## 509 509 Islamabad, Pakistan 25.86
## 512 512 Jaipur, India 25.46
## 513 513 Indore, India 25.40
## 514 514 Thane, India 25.31
## 515 515 Chennai, India 25.20
## 516 516 Kolkata, India 24.80
## 517 517 Lucknow (Lakhnau), India 24.75
## 518 518 Goa, India 24.34
## 519 519 Ahmedabad, India 24.24
## 521 521 Karachi, Pakistan 23.90
## 523 523 Surat, India 23.77
## 524 524 Hyderabad, India 23.59
## 525 525 Nagpur, India 22.76
## 526 526 Guwahati, India 22.68
## 527 527 Mysore, India 22.41
## 528 528 Bhubaneswar, India 22.40
## 529 529 Mangalore, India 22.40
## 530 530 Coimbatore, India 22.38
## 531 531 Bhopal, India 22.37
## 532 532 Vadodara, India 22.28
## 533 533 Kochi, India 21.73
## 534 534 Visakhapatnam, India 21.52
## 535 535 Navi Mumbai, India 19.30
## 536 536 Thiruvananthapuram, India 19.26
## Rent.Index Cost.of.Living.Plus.Rent.Index Groceries.Index
## 406 13.25 26.81 30.18
## 421 11.36 25.11 27.90
## 425 11.67 25.08 27.34
## 433 11.63 24.55 33.43
## 449 6.56 21.42 29.59
## 456 11.28 23.31 29.17
## 464 5.74 20.48 26.98
## 478 7.23 20.16 25.59
## 483 9.49 21.06 28.92
## 486 9.96 20.89 26.63
## 495 20.31 24.90 26.63
## 497 8.73 19.23 25.80
## 498 6.18 17.96 25.14
## 501 7.38 17.93 26.76
## 503 4.40 16.39 25.51
## 504 8.60 18.20 26.53
## 507 8.36 17.78 22.23
## 508 5.70 16.39 25.46
## 509 7.48 17.16 23.37
## 512 4.98 15.76 23.87
## 513 4.40 15.46 25.73
## 514 9.89 18.01 24.18
## 515 6.90 16.53 25.91
## 516 6.00 15.90 23.35
## 517 4.44 15.14 23.21
## 518 6.21 15.76 24.63
## 519 5.19 15.22 24.89
## 521 6.15 15.50 20.89
## 523 3.78 14.31 23.78
## 524 5.99 15.26 23.02
## 525 4.50 14.12 21.62
## 526 4.04 13.85 22.91
## 527 4.32 13.85 23.87
## 528 4.40 13.88 23.66
## 529 5.05 14.19 22.21
## 530 5.21 14.25 22.45
## 531 3.43 13.41 20.13
## 532 3.78 13.52 22.26
## 533 5.45 14.02 21.93
## 534 4.26 13.35 21.09
## 535 4.70 12.39 19.21
## 536 4.69 12.36 18.14
## Restaurant.Price.Index Local.Purchasing.Power.Index
## 406 33.34 77.35
## 421 32.27 77.78
## 425 31.56 71.81
## 433 28.20 82.62
## 449 25.13 64.55
## 456 33.07 79.87
## 464 21.44 57.91
## 478 24.92 59.11
## 483 28.03 64.69
## 486 27.52 113.89
## 495 26.36 67.69
## 497 25.30 77.75
## 498 24.53 89.48
## 501 22.68 86.55
## 503 21.18 68.43
## 504 18.70 96.51
## 507 21.10 68.94
## 508 19.17 64.37
## 509 19.20 50.11
## 512 18.29 77.10
## 513 15.97 50.73
## 514 20.97 81.00
## 515 15.97 67.87
## 516 21.09 60.41
## 517 19.82 76.50
## 518 20.14 54.97
## 519 17.40 70.18
## 521 18.57 36.66
## 523 17.75 66.45
## 524 17.35 78.00
## 525 16.99 98.45
## 526 13.70 71.26
## 527 13.38 45.78
## 528 13.42 67.00
## 529 15.92 79.58
## 530 14.39 56.46
## 531 15.56 68.22
## 532 14.43 74.59
## 533 12.20 73.42
## 534 17.09 55.47
## 535 12.55 138.06
## 536 11.93 68.15data[myKmean$cluster==5,]## Rank City Cost.of.Living.Index
## 25 25 Tokyo, Japan 84.78
## 26 26 Paris, France 84.68
## 27 27 Odense, Denmark 84.09
## 30 30 Aalborg, Denmark 82.21
## 31 31 Amsterdam, Netherlands 82.14
## 32 32 Seoul, South Korea 81.96
## 33 33 Arhus, Denmark 81.94
## 34 34 London, United Kingdom 81.31
## 36 36 Helsinki, Finland 80.60
## 38 38 Singapore, Singapore 80.40
## 39 39 Dublin, Ireland 80.28
## 40 40 Sydney, Australia 79.93
## 41 41 Hartford, CT, United States 79.85
## 42 42 Albany, NY, United States 79.38
## 43 43 Philadelphia, PA, United States 79.25
## 44 44 Tampere, Finland 79.04
## 45 45 Milton Keynes, United Kingdom 78.50
## 46 46 Grenoble, France 78.43
## 47 47 Irvine, CA, United States 78.38
## 48 48 Lyon, France 78.00
## 49 49 Long Beach, CA, United States 77.95
## 50 50 Linz, Austria 77.80
## 51 51 Los Angeles, CA, United States 77.66
## 52 52 Tel Aviv-Yafo, Israel 77.39
## 53 53 Barrie, Canada 77.37
## 54 54 Chicago, IL, United States 77.33
## 55 55 Stockholm, Sweden 77.23
## 56 56 Florence, Italy 77.21
## 57 57 Boulder, CO, United States 77.16
## 58 58 The Hague (Den Haag), Netherlands 76.75
## 59 59 Reading, United Kingdom 76.73
## 60 60 Auckland, New Zealand 76.63
## 61 61 Jerusalem, Israel 76.62
## 62 62 Bordeaux, France 76.31
## 63 63 Utrecht, Netherlands 76.30
## 64 64 Toulouse, France 76.30
## 65 65 San Jose, CA, United States 76.28
## 66 66 Burlington, VT, United States 76.11
## 67 67 Pittsburgh, PA, United States 76.04
## 68 68 Nice, France 75.84
## 69 69 Miami, FL, United States 75.83
## 70 70 Brussels, Belgium 75.69
## 71 71 Graz, Austria 75.61
## 72 72 Santa Barbara, CA, United States 75.55
## 73 73 Sacramento, CA, United States 75.54
## 74 74 Strasbourg, France 75.47
## 75 75 Genoa, Italy 75.38
## 76 76 Gent, Belgium 75.27
## 77 77 Perth, Australia 75.09
## 78 78 Antwerp, Belgium 74.88
## 79 79 Portland, ME, United States 74.81
## 80 80 West Palm Beach, FL, United States 74.79
## 81 81 Hong Kong, Hong Kong 74.73
## 82 82 Innsbruck, Austria 74.66
## 83 83 Leuven, Belgium 74.58
## 84 84 Leiden, Netherlands 74.56
## 85 85 Osaka, Japan 74.53
## 86 86 Melbourne, Australia 74.53
## 87 87 Bath, United Kingdom 74.48
## 88 88 Everett, WA, United States 74.36
## 89 89 Saskatoon, Canada 74.26
## 90 90 Tacoma, WA, United States 74.21
## 91 91 Portland, OR, United States 74.17
## 92 92 Rotterdam, Netherlands 74.08
## 93 93 Montpellier, France 74.08
## 94 94 St. John's, NL, Canada 74.05
## 95 95 Milan, Italy 73.89
## 96 96 Maastricht, Netherlands 73.87
## 97 97 Baltimore, MD, United States 73.85
## 98 98 Munich, Germany 73.79
## 99 99 Espoo, Finland 73.78
## 100 100 New Orleans, LA, United States 73.61
## 101 101 Galway, Ireland 73.54
## 102 102 Cork, Ireland 73.53
## 103 103 Padova, Italy 73.49
## 104 104 Haifa, Israel 73.42
## 105 105 Charlotte, NC, United States 73.33
## 106 106 Burlington, Canada 73.13
## 107 107 Aberdeen, United Kingdom 73.02
## 108 108 Dusseldorf, Germany 73.00
## 109 109 Minneapolis, MN, United States 72.93
## 110 110 Adelaide, Australia 72.92
## 111 111 Eindhoven, Netherlands 72.82
## 112 112 Cambridge, United Kingdom 72.60
## 113 113 Oxford, United Kingdom 72.60
## 114 114 Darwin, Australia 72.47
## 115 115 Eugene, OR, United States 72.46
## 116 116 Nantes, France 72.37
## 117 117 Groningen, Netherlands 72.29
## 118 118 San Diego, CA, United States 72.29
## 119 119 Ramat Gan, Israel 72.15
## 120 120 Hamburg, Germany 72.15
## 121 121 Bellingham, WA, United States 72.14
## 122 122 Atlanta, GA, United States 72.05
## 123 123 Denver, CO, United States 72.02
## 124 124 Saint Paul, MN, United States 71.94
## 125 125 Hamilton, New Zealand 71.91
## 126 126 Birmingham, AL, United States 71.87
## 127 127 Frankfurt, Germany 71.64
## 128 128 Wellington, New Zealand 71.52
## 129 129 Asheville, NC, United States 71.52
## 130 130 Trieste, Italy 71.51
## 131 131 Fort Myers, FL, United States 71.50
## 132 132 Newcastle, Australia 71.42
## 133 133 Portsmouth, United Kingdom 71.04
## 134 134 Halifax, Canada 70.88
## 135 135 Vienna, Austria 70.86
## 136 136 Heidelberg, Germany 70.82
## 137 137 Indianapolis, IN, United States 70.79
## 138 138 Edinburgh, United Kingdom 70.73
## 139 139 Jacksonville, FL, United States 70.62
## 140 140 Buffalo, NY, United States 70.59
## 141 141 Olympia, WA, United States 70.57
## 142 142 Saint Petersburg, FL, United States 70.49
## 143 143 Austin, TX, United States 70.49
## 144 144 Brisbane, Australia 70.46
## 146 146 Sliema, Malta 70.33
## 147 147 Rochester, NY, United States 70.25
## 148 148 Christchurch, New Zealand 70.23
## 149 149 Toronto, Canada 70.19
## 150 150 Orlando, FL, United States 70.18
## 151 151 Dunedin, New Zealand 70.16
## 152 152 Turku, Finland 70.13
## 153 153 Plymouth, United Kingdom 70.02
## 154 154 Swindon, United Kingdom 69.92
## 155 155 Canberra, Australia 69.88
## 156 156 Manchester, United Kingdom 69.86
## 157 157 Peoria, IL, United States 69.84
## 158 158 Gothenburg, Sweden 69.77
## 159 159 Cleveland, OH, United States 69.65
## 160 160 Vancouver, Canada 69.63
## 161 161 Limerick, Ireland 69.63
## 162 162 Bristol, United Kingdom 69.58
## 163 163 Brighton, United Kingdom 69.54
## 164 164 Bologna, Italy 69.50
## 165 165 York, United Kingdom 69.33
## 166 166 Karlsruhe, Germany 69.26
## 167 167 Raleigh, NC, United States 69.18
## 168 168 Bonn, Germany 69.14
## 169 169 Hobart, Australia 69.10
## 170 170 Arlington, TX, United States 69.07
## 171 171 Rome, Italy 69.03
## 172 172 Saint Louis, MO, United States 69.02
## 173 173 Bremen, Germany 68.93
## 174 174 Calgary, Canada 68.93
## 175 175 Milwaukee, WI, United States 68.81
## 176 176 Brampton, Canada 68.79
## 177 177 Nashville, TN, United States 68.78
## 178 178 Uppsala, Sweden 68.75
## 179 179 Tampa, FL, United States 68.61
## 180 180 Regina, Canada 68.46
## 181 181 Mannheim, Germany 68.35
## 182 182 Leeds, United Kingdom 68.26
## 183 183 Virginia Beach, VA, United States 67.86
## 184 184 Berlin, Germany 67.75
## 185 185 Lille, France 67.73
## 186 186 Syracuse, NY, United States 67.55
## 187 187 Stuttgart, Germany 67.46
## 188 188 Coquitlam, Canada 67.43
## 189 189 Red Deer, Canada 67.42
## 190 190 Cologne, Germany 67.36
## 191 191 Aachen, Germany 67.33
## 192 192 Tallahassee, FL, United States 67.24
## 193 193 Bakersfield, CA, United States 67.11
## 194 194 Ann Arbor, MI, United States 67.06
## 195 195 Nottingham, United Kingdom 67.05
## 196 196 Edmonton, Canada 67.03
## 197 197 Las Vegas, NV, United States 66.98
## 198 198 Columbus, OH, United States 66.90
## 199 199 Turin, Italy 66.68
## 200 200 Spokane, WA, United States 66.60
## 201 201 Kelowna, Canada 66.60
## 202 202 Exeter, United Kingdom 66.56
## 203 203 Glasgow, United Kingdom 66.50
## 204 204 Memphis, TN, United States 66.49
## 205 205 Kingston, Canada 66.45
## 206 206 Nuremberg, Germany 66.44
## 207 207 Coventry, United Kingdom 66.31
## 208 208 Columbia, SC, United States 66.23
## 209 209 Victoria, Canada 66.17
## 210 210 Malmo, Sweden 66.14
## 211 211 Salem, OR, United States 66.04
## 212 212 Leipzig, Germany 66.04
## 213 213 Dresden, Germany 65.92
## 214 214 Fort Wayne, IN, United States 65.88
## 215 215 Dayton, OH, United States 65.84
## 216 216 San Juan, Puerto Rico 65.79
## 217 217 Taipei, Taiwan 65.75
## 218 218 Kansas City, MO, United States 65.74
## 219 219 Leicester, United Kingdom 65.59
## 220 220 Oshawa, Canada 65.44
## 221 221 Nanaimo, BC, Canada 65.28
## 222 222 Fort Worth, TX, United States 65.19
## 223 223 Palma de Mallorca, Spain 65.17
## 224 224 Mississauga, Canada 65.08
## 225 225 Quebec City, Canada 65.07
## 226 226 Norwich, United Kingdom 64.95
## 227 227 Burnaby, Canada 64.94
## 228 228 Fayetteville, AR, United States 64.84
## 230 230 Derby, United Kingdom 64.70
## 231 231 Marseille, France 64.64
## 233 233 Hanover, Germany 64.57
## 234 234 Richmond, VA, United States 64.56
## 235 235 Gold Coast, Australia 64.53
## 236 236 Greensboro, NC, United States 64.46
## 237 237 Birmingham, United Kingdom 64.46
## 238 238 Windsor, Canada 64.42
## 239 239 Dallas, TX, United States 64.32
## 240 240 Albuquerque, NM, United States 64.32
## 241 241 Phoenix, AZ, United States 64.31
## 242 242 Southampton, United Kingdom 63.73
## 243 243 Gainesville, FL, United States 63.62
## 244 244 Montreal, Canada 63.52
## 245 245 Grand Rapids, MI, United States 63.47
## 246 246 Tucson, AZ, United States 63.35
## 247 247 Madison, WI, United States 63.30
## 248 248 Chattanooga, TN, United States 63.28
## 249 249 Fresno, CA, United States 63.25
## 250 250 Wichita, KS, United States 63.18
## 251 251 Winnipeg, Canada 63.15
## 252 252 Cagliari, Italy 63.15
## 253 253 Salt Lake City, UT, United States 62.94
## 254 254 Ottawa, Canada 62.88
## 255 255 Doha, Qatar 62.81
## 256 256 Detroit, MI, United States 62.77
## 257 257 Newcastle upon Tyne, United Kingdom 62.76
## 258 258 Tulsa, OK, United States 62.67
## 259 259 Cincinnati, OH, United States 62.65
## 260 260 Sheffield, United Kingdom 62.64
## 261 261 Belfast, United Kingdom 62.42
## 262 262 Lubbock, TX, United States 62.40
## 264 264 Des Moines, IA, United States 62.21
## 265 265 Houston, TX, United States 62.16
## 267 267 Cardiff, United Kingdom 62.12
## 268 268 Liverpool, United Kingdom 62.00
## 269 269 Abu Dhabi, United Arab Emirates 61.94
## 270 270 Oklahoma City, OK, United States 61.72
## 272 272 Moncton, Canada 61.15
## 274 274 Knoxville, TN, United States 60.97
## 276 276 Hamilton, Canada 60.75
## 277 277 Springfield, MO, United States 60.56
## 278 278 Vancouver, WA, United States 60.46
## 280 280 Toledo, OH, United States 60.35
## 281 281 Little Rock, AR, United States 60.31
## 282 282 Louisville, KY, United States 60.24
## 283 283 Madrid, Spain 60.12
## 284 284 Reno, NV, United States 59.84
## 285 285 Huntsville, AL, United States 59.80
## 286 286 Lexington, KY, United States 59.64
## 288 288 Boise, ID, United States 59.43
## 289 289 El Paso, TX, United States 59.37
## 290 290 Surrey, Canada 59.18
## 291 291 London, Canada 59.15
## 292 292 Abbotsford, Canada 58.95
## 293 293 Kitchener, Canada 58.93
## 294 294 San Antonio, TX, United States 58.12
## 315 315 Dubai, United Arab Emirates 53.32
## Rent.Index Cost.of.Living.Plus.Rent.Index Groceries.Index
## 25 36.41 61.89 81.72
## 26 47.60 67.13 73.77
## 27 23.31 55.32 65.29
## 30 24.92 55.09 62.32
## 31 54.65 69.13 62.35
## 32 33.01 58.79 93.57
## 33 31.71 58.16 61.47
## 34 70.30 76.10 57.74
## 36 35.69 59.34 61.31
## 38 60.38 70.92 66.82
## 39 60.12 70.73 60.82
## 40 62.58 71.72 68.63
## 41 41.58 61.73 83.41
## 42 31.01 56.48 77.50
## 43 49.35 65.10 74.58
## 44 26.21 54.03 68.46
## 45 34.45 57.65 71.63
## 46 23.34 52.35 73.56
## 47 65.75 72.40 73.87
## 48 27.34 54.02 69.55
## 49 55.18 67.17 74.93
## 50 26.66 53.59 67.39
## 51 70.45 74.25 71.59
## 52 40.57 59.96 62.34
## 53 29.08 54.51 73.87
## 54 55.53 67.01 70.69
## 55 40.18 59.69 64.74
## 56 29.07 54.42 63.10
## 57 53.54 65.98 76.79
## 58 35.79 57.36 58.82
## 59 39.11 58.92 63.73
## 60 42.90 60.67 66.39
## 61 34.34 56.60 60.65
## 62 26.10 52.54 67.34
## 63 37.46 57.92 58.34
## 64 23.03 51.09 66.45
## 65 76.61 76.43 71.10
## 66 41.81 59.87 73.17
## 67 38.23 58.15 71.89
## 68 29.77 54.03 69.04
## 69 57.81 67.30 67.27
## 70 32.03 55.02 63.45
## 71 23.23 50.82 71.92
## 72 68.66 72.29 67.52
## 73 44.29 60.75 69.09
## 74 23.02 50.64 65.79
## 75 20.01 49.17 63.25
## 76 25.78 51.85 57.88
## 77 33.44 55.38 65.24
## 78 25.38 51.45 61.20
## 79 42.40 59.47 72.45
## 80 42.16 59.34 70.55
## 81 78.33 76.44 74.88
## 82 30.67 53.84 61.87
## 83 28.04 52.55 59.51
## 84 33.80 55.26 56.34
## 85 22.37 49.84 68.32
## 86 42.73 59.48 67.10
## 87 34.60 55.60 61.79
## 88 43.44 59.72 72.61
## 89 26.16 51.49 72.37
## 90 38.62 57.36 71.42
## 91 50.67 63.05 69.19
## 92 33.42 54.83 53.99
## 93 24.82 50.76 62.71
## 94 21.80 49.32 70.28
## 95 39.56 57.63 59.19
## 96 32.10 54.10 59.93
## 97 42.89 59.20 68.71
## 98 45.18 60.25 56.28
## 99 31.47 53.75 58.58
## 100 41.21 58.27 67.00
## 101 34.02 54.83 61.77
## 102 37.58 56.51 57.77
## 103 21.74 48.99 60.51
## 104 19.47 47.88 55.23
## 105 41.65 58.33 69.21
## 106 32.42 53.86 64.86
## 107 27.95 51.69 57.21
## 108 32.84 53.99 53.33
## 109 46.18 60.27 68.29
## 110 31.99 53.54 67.23
## 111 34.10 54.49 56.19
## 112 43.84 58.99 54.62
## 113 48.82 61.34 51.41
## 114 35.59 55.01 64.71
## 115 30.44 52.57 78.36
## 116 21.78 48.42 62.75
## 117 28.84 51.72 58.44
## 118 61.06 66.97 64.11
## 119 33.39 53.80 54.27
## 120 35.25 54.68 54.35
## 121 34.17 54.17 68.93
## 122 46.89 60.14 66.94
## 123 54.09 63.53 67.92
## 124 45.24 59.30 70.22
## 125 23.11 48.81 61.23
## 126 34.03 53.96 69.40
## 127 34.99 54.29 53.12
## 128 39.68 56.45 63.85
## 129 37.19 55.27 71.47
## 130 19.64 46.96 64.67
## 131 33.45 53.49 68.78
## 132 37.63 55.43 63.56
## 133 31.44 52.29 51.81
## 134 28.05 50.60 72.43
## 135 32.48 52.70 63.61
## 136 33.51 53.16 53.85
## 137 34.81 53.76 67.20
## 138 33.44 53.08 58.75
## 139 31.36 52.04 69.00
## 140 29.30 51.04 62.31
## 141 40.40 56.28 60.02
## 142 40.59 56.33 66.03
## 143 50.35 60.96 65.81
## 144 39.13 55.63 60.45
## 146 35.72 53.94 55.05
## 147 30.81 51.58 69.88
## 148 26.28 49.42 61.00
## 149 44.28 57.92 64.15
## 150 38.43 55.15 68.50
## 151 21.81 47.27 60.78
## 152 22.11 47.40 53.18
## 153 20.31 46.49 58.63
## 154 29.46 50.77 49.50
## 155 40.63 56.03 63.26
## 156 30.37 51.17 52.69
## 157 25.55 48.88 68.44
## 158 29.33 50.62 60.31
## 159 28.24 50.05 62.06
## 160 49.26 59.98 66.65
## 161 28.14 49.99 60.78
## 162 36.53 53.93 52.44
## 163 42.42 56.70 52.95
## 164 24.03 47.98 54.96
## 165 28.87 50.18 55.98
## 166 21.71 46.75 52.43
## 167 36.18 53.56 71.88
## 168 27.28 49.32 52.20
## 169 27.95 49.62 64.66
## 170 30.98 51.04 64.58
## 171 36.69 53.72 55.28
## 172 29.42 50.28 65.14
## 173 21.86 46.65 53.13
## 174 29.85 50.43 60.75
## 175 35.57 53.07 63.74
## 176 28.91 49.91 68.60
## 177 49.17 59.50 64.10
## 178 25.43 48.24 58.12
## 179 39.54 54.85 65.38
## 180 28.00 49.31 66.75
## 181 22.17 46.49 52.00
## 182 28.05 49.23 53.36
## 183 35.84 52.70 62.06
## 184 31.64 50.65 52.31
## 185 22.98 46.55 52.70
## 186 33.60 51.48 63.81
## 187 33.30 51.29 49.06
## 188 35.02 52.09 66.05
## 189 23.58 46.66 55.68
## 190 29.64 49.51 51.53
## 191 22.76 46.23 52.03
## 192 26.47 47.94 71.30
## 193 28.95 49.05 63.16
## 194 47.59 57.84 60.70
## 195 23.63 46.50 54.03
## 196 29.22 49.13 60.51
## 197 29.55 49.27 59.56
## 198 36.92 52.71 58.94
## 199 20.97 45.04 52.98
## 200 28.33 48.49 59.19
## 201 33.08 50.73 62.58
## 202 29.55 49.04 48.27
## 203 27.49 48.04 51.88
## 204 26.58 47.60 59.36
## 205 26.88 47.72 64.50
## 206 24.08 46.39 50.10
## 207 26.92 47.66 52.61
## 208 27.73 48.01 65.60
## 209 38.10 52.88 65.05
## 210 26.09 47.18 56.60
## 211 28.93 48.48 61.63
## 212 19.98 44.24 50.44
## 213 21.68 44.98 50.52
## 214 21.74 44.98 70.07
## 215 21.97 45.07 62.60
## 216 24.43 46.21 59.19
## 217 22.74 45.39 73.78
## 218 30.53 49.07 58.43
## 219 22.41 45.15 51.01
## 220 27.37 47.42 55.97
## 221 24.29 45.88 68.45
## 222 35.53 51.15 56.86
## 223 27.12 47.16 50.72
## 224 35.79 51.22 58.39
## 225 16.10 41.89 62.78
## 226 23.69 45.42 48.98
## 227 40.95 53.59 58.52
## 228 25.90 46.41 61.15
## 230 19.76 43.43 51.11
## 231 23.63 45.23 54.31
## 233 22.82 44.80 53.06
## 234 35.24 50.68 63.54
## 235 37.37 51.68 59.94
## 236 27.34 46.89 63.03
## 237 30.50 48.38 48.03
## 238 21.98 44.33 51.65
## 239 43.15 54.30 58.50
## 240 27.29 46.79 64.42
## 241 33.65 49.79 56.58
## 242 31.44 48.45 48.32
## 243 29.02 47.24 60.52
## 244 25.25 45.40 60.69
## 245 31.04 48.12 55.26
## 246 23.63 44.55 52.48
## 247 37.52 51.09 56.66
## 248 29.58 47.33 57.19
## 249 30.12 47.57 54.68
## 250 23.45 44.38 57.30
## 251 23.70 44.48 57.33
## 252 19.23 42.36 55.09
## 253 35.80 50.10 55.93
## 254 30.26 47.44 54.70
## 255 56.39 59.77 51.33
## 256 34.22 49.25 56.21
## 257 22.89 43.89 45.04
## 258 26.87 45.72 59.49
## 259 31.03 47.68 52.40
## 260 23.00 43.88 49.09
## 261 22.62 43.58 50.78
## 262 24.28 44.35 56.80
## 264 33.57 48.66 57.09
## 265 43.11 53.14 54.36
## 267 28.79 46.34 52.30
## 268 24.72 44.35 44.70
## 269 58.43 60.28 50.11
## 270 25.72 44.68 60.18
## 272 17.69 40.58 54.08
## 274 28.75 45.72 59.45
## 276 26.34 44.46 53.08
## 277 18.66 40.73 60.68
## 278 35.97 48.87 50.54
## 280 21.26 41.84 50.89
## 281 26.40 44.26 55.44
## 282 26.86 44.44 53.87
## 283 31.59 46.62 45.69
## 284 38.03 49.51 51.96
## 285 28.65 45.06 58.83
## 286 24.86 43.17 54.50
## 288 30.85 45.90 50.93
## 289 22.16 41.76 54.07
## 290 30.36 45.54 51.61
## 291 23.08 42.08 47.61
## 292 25.01 42.89 54.08
## 293 25.38 43.05 51.13
## 294 31.26 45.41 55.20
## 315 49.32 51.42 37.47
## Restaurant.Price.Index Local.Purchasing.Power.Index
## 25 54.41 113.09
## 26 88.11 95.38
## 27 112.90 114.26
## 30 97.34 113.36
## 31 87.71 98.88
## 32 50.34 102.63
## 33 95.15 116.80
## 34 91.85 100.22
## 36 94.99 108.83
## 38 59.40 99.15
## 39 87.98 89.32
## 40 69.34 128.25
## 41 72.82 84.71
## 42 77.64 108.77
## 43 74.75 109.34
## 44 79.47 114.89
## 45 78.53 93.47
## 46 72.47 108.39
## 47 73.72 135.16
## 48 72.77 96.07
## 49 77.97 128.82
## 50 80.73 99.34
## 51 81.71 114.51
## 52 85.86 93.67
## 53 83.57 99.44
## 54 78.52 133.70
## 55 85.51 115.83
## 56 88.19 70.47
## 57 68.35 112.76
## 58 84.91 102.30
## 59 84.93 125.69
## 60 65.02 103.52
## 61 85.41 85.39
## 62 77.60 83.45
## 63 88.94 103.12
## 64 74.72 105.57
## 65 83.14 170.91
## 66 78.69 76.97
## 67 66.74 114.28
## 68 84.70 112.81
## 69 81.89 89.99
## 70 87.07 100.24
## 71 60.92 100.33
## 72 91.99 124.41
## 73 77.91 145.88
## 74 75.80 100.44
## 75 77.18 77.62
## 76 88.45 94.77
## 77 79.28 139.93
## 78 86.36 97.30
## 79 85.71 122.77
## 80 82.50 119.13
## 81 54.05 76.49
## 82 71.50 95.54
## 83 80.36 96.92
## 84 84.44 93.41
## 85 46.37 102.10
## 86 70.76 131.85
## 87 81.23 125.99
## 88 73.78 119.38
## 89 65.25 103.89
## 90 71.47 130.05
## 91 71.60 126.03
## 92 81.15 111.02
## 93 70.81 94.37
## 94 81.11 96.78
## 95 84.57 74.87
## 96 72.83 104.75
## 97 77.01 127.77
## 98 80.50 114.57
## 99 90.89 121.22
## 100 86.02 106.74
## 101 75.27 94.56
## 102 74.67 109.85
## 103 72.30 80.96
## 104 86.23 100.60
## 105 76.67 142.25
## 106 72.71 119.67
## 107 90.52 128.24
## 108 67.20 115.58
## 109 75.64 133.75
## 110 68.26 127.17
## 111 83.88 121.84
## 112 86.14 106.28
## 113 77.46 87.88
## 114 78.11 122.21
## 115 67.68 99.50
## 116 71.65 104.62
## 117 81.94 96.13
## 118 79.21 144.91
## 119 79.83 112.68
## 120 70.09 113.28
## 121 71.96 114.33
## 122 73.06 150.38
## 123 76.90 130.34
## 124 74.59 111.58
## 125 71.79 114.79
## 126 69.34 107.87
## 127 74.50 132.91
## 128 64.54 116.39
## 129 70.69 104.81
## 130 71.20 91.24
## 131 77.88 104.54
## 132 79.19 142.12
## 133 87.08 107.73
## 134 61.05 99.86
## 135 67.94 104.56
## 136 66.51 135.30
## 137 71.87 109.93
## 138 80.86 110.16
## 139 67.63 132.56
## 140 72.75 111.16
## 141 78.68 135.82
## 142 72.96 127.77
## 143 78.34 151.25
## 144 69.33 134.54
## 146 82.28 70.43
## 147 71.98 91.12
## 148 70.54 111.52
## 149 67.53 99.45
## 150 69.67 130.10
## 151 64.07 112.89
## 152 81.05 126.99
## 153 71.32 111.90
## 154 81.79 128.46
## 155 70.06 153.77
## 156 80.84 107.70
## 157 63.92 118.14
## 158 75.49 122.33
## 159 69.68 105.12
## 160 67.35 94.65
## 161 67.61 98.85
## 162 87.30 117.20
## 163 78.93 87.36
## 164 78.34 85.60
## 165 78.14 113.55
## 166 74.86 161.95
## 167 66.40 155.96
## 168 67.80 112.56
## 169 76.92 124.03
## 170 62.75 141.64
## 171 78.14 72.99
## 172 71.31 149.05
## 173 67.53 126.88
## 174 71.93 138.51
## 175 71.41 107.87
## 176 58.42 99.86
## 177 76.79 136.29
## 178 76.33 122.17
## 179 72.99 140.97
## 180 59.29 112.05
## 181 66.93 141.04
## 182 80.41 119.62
## 183 71.73 161.28
## 184 58.53 112.36
## 185 66.87 97.87
## 186 68.60 94.96
## 187 64.14 130.11
## 188 58.84 124.45
## 189 65.18 140.16
## 190 66.42 133.27
## 191 59.44 134.85
## 192 59.97 128.82
## 193 70.58 151.58
## 194 58.50 128.99
## 195 66.60 106.22
## 196 69.57 129.45
## 197 72.20 144.40
## 198 66.04 128.77
## 199 72.24 86.70
## 200 68.65 124.45
## 201 61.82 108.98
## 202 78.62 87.24
## 203 75.35 121.47
## 204 70.42 125.07
## 205 60.41 113.98
## 206 66.17 120.91
## 207 68.35 138.99
## 208 67.08 124.84
## 209 59.95 106.89
## 210 72.21 107.14
## 211 63.28 125.24
## 212 57.36 90.74
## 213 56.77 131.77
## 214 63.82 124.37
## 215 64.97 91.21
## 216 56.46 110.36
## 217 32.95 95.59
## 218 68.12 138.60
## 219 71.76 107.34
## 220 68.51 119.92
## 221 58.51 100.45
## 222 70.27 140.43
## 223 66.04 78.81
## 224 60.01 112.72
## 225 60.07 140.18
## 226 76.45 92.06
## 227 59.61 151.02
## 228 67.22 109.58
## 230 67.14 146.98
## 231 63.64 92.65
## 233 60.00 152.96
## 234 62.47 132.62
## 235 64.12 129.83
## 236 61.80 133.53
## 237 80.25 106.94
## 238 68.38 109.87
## 239 68.02 153.42
## 240 63.21 128.27
## 241 72.47 146.15
## 242 70.79 139.02
## 243 58.47 106.34
## 244 61.07 117.12
## 245 71.44 129.66
## 246 63.98 122.68
## 247 65.73 144.61
## 248 60.41 124.02
## 249 76.08 120.12
## 250 64.33 135.99
## 251 58.50 115.79
## 252 64.01 88.55
## 253 66.10 150.76
## 254 62.10 144.70
## 255 61.18 139.76
## 256 51.65 97.41
## 257 70.56 133.83
## 258 62.36 129.54
## 259 63.41 137.31
## 260 71.97 119.46
## 261 77.19 100.69
## 262 64.34 135.19
## 264 63.36 128.68
## 265 72.49 155.88
## 267 67.16 116.48
## 268 67.48 121.31
## 269 63.20 116.42
## 270 56.84 136.21
## 272 60.71 112.73
## 274 59.43 116.61
## 276 62.20 127.16
## 277 61.21 102.88
## 278 61.81 153.07
## 280 55.69 125.57
## 281 63.52 144.07
## 282 66.45 123.93
## 283 64.44 91.36
## 284 62.27 136.81
## 285 60.20 162.04
## 286 60.08 141.91
## 288 63.79 120.44
## 289 59.41 131.70
## 290 57.55 93.91
## 291 63.25 118.79
## 292 59.78 111.27
## 293 58.73 129.74
## 294 52.09 150.96
## 315 54.61 153.68#sqrt(rowSums(data[,3:8] - fitted(myKmean)) ^ 2)Write up:
In order to discover strong patterns from our large data set, we conduct a principal component analysis. Moreover, to conduct the analysis, non-numeric data was removed as well as rank (since rank and cost of living index are 100% correlated). We begin our analysis by constructing a biplot (loading plot) to visualize how strongly each characteristic influences the first two principal components. Although the biplot is somewhat hard to read, we see that almost all variables are strongly influencing the second principal component, with the exception being Purchasing.Power.Index which is more evenly inluencing both of the first two principal components. The biplot also shows us how characteristics correlate with one another, and so it seems purchasing power index has a low correlation with all the other variables, yet those variables are all highly correlated with one another. In an attempt to gain more information we plot a 2D-projection of all the principal components and realize very little useful information. To analyze our principal coponents further, we look at the summary statistics for our analysis to see which principal components we can toss out. By the Kaiser method (SD>1) we should retain just one principal component. However if we wish to retain at least 90% of the variance in the data we should retain two principal components, which is supported by our scree plots. Therefore we interpret the weights of the first two principal components. Judging the first principal component, we notice high negative loadings on all the variables, meaning all variables are negatively correlates with each other. Thus the loadings on the first principal component seem to represent places where it is very expensive to live despite the low correlation between the various predictor variables. Futhermore, the loadings on the second principal component seem to represent places where it is very expensive to live yet your money goea a lot further in terms of purchasing power. Clearly, there is some distinct grouping in this data set. That is, cities are grouped based on some distinct characteristics contributing to their ranks. This is well vizualized in our plotted projection of the retained components.
Now that we have simpified our data and found some patterns, we are going to classify these “unique” cities into clusters using K-means for further understanding. First we need to determine the number of clusters (k) to use. Here we find k by plotting our whithin group sum of squares and finding the “elbow” in the plot. Examinig our within group sum of squares plot we conclude a k equal to five should be used. Five is quite unexpected, since the plotted projection of the retained components seemingly forshadows two distinct groups. Next, we go ahead and run our k-means classifier using our chosen value for k, and plot the results. Our retained PC’s k-means cluster projection plot beautifully depicts five distinct groups. Finally we print out our groups and interpret the results of our k-means. These results are incredibly interesting. Broadly, the groups seem to be representative of regions of similar levels of wealth. This makes perfect sense, since you would expect cities in regions/nations of similar wealth to have a similar cost of living. Strikinginly, however, cities seem to be slightly grouped by the similar economic policy of their respective country. Our first cluster for instance, contains a high volume of the total cities from Switzerland, Bermuda, Iceland, and Norway, all of whom are famous for having significantly developed service sectors, especially their respective banking industries. This trent continues throughout the groups. Lastly, due to the large variance in cluster size, within groups sum of squares was not an accurate measure of perfomance, though when calculating the maximum euclidean distance from the centroids, we received similar values for all but one group.
Random Forest and Neural Network Regression
First draft Random Forest with no training/testing data seperation
library(randomForest)## Warning: package 'randomForest' was built under R version 3.4.4## randomForest 4.6-14## Type rfNews() to see new features/changes/bug fixes.##
## Attaching package: 'randomForest'## The following object is masked from 'package:ggplot2':
##
## margincityRate1 = randomForest(Cost.of.Living.Index ~ Rank + Rent.Index + Cost.of.Living.Plus.Rent.Index + Groceries.Index + Restaurant.Price.Index + Local.Purchasing.Power.Index, data = data, importance = TRUE, ntree = 500, mtry = 2)#limit randomise variable for forest
cityRate1##
## Call:
## randomForest(formula = Cost.of.Living.Index ~ Rank + Rent.Index + Cost.of.Living.Plus.Rent.Index + Groceries.Index + Restaurant.Price.Index + Local.Purchasing.Power.Index, data = data, importance = TRUE, ntree = 500, mtry = 2)
## Type of random forest: regression
## Number of trees: 500
## No. of variables tried at each split: 2
##
## Mean of squared residuals: 1.586516
## % Var explained: 99.6importance(cityRate1)## %IncMSE IncNodePurity
## Rank 26.913689 77952.8499
## Rent.Index 10.203268 11153.4281
## Cost.of.Living.Plus.Rent.Index 17.310715 51061.0545
## Groceries.Index 15.532442 40390.3542
## Restaurant.Price.Index 14.534015 31795.2511
## Local.Purchasing.Power.Index 6.984636 677.7968summary(cityRate1)## Length Class Mode
## call 6 -none- call
## type 1 -none- character
## predicted 536 -none- numeric
## mse 500 -none- numeric
## rsq 500 -none- numeric
## oob.times 536 -none- numeric
## importance 12 -none- numeric
## importanceSD 6 -none- numeric
## localImportance 0 -none- NULL
## proximity 0 -none- NULL
## ntree 1 -none- numeric
## mtry 1 -none- numeric
## forest 11 -none- list
## coefs 0 -none- NULL
## y 536 -none- numeric
## test 0 -none- NULL
## inbag 0 -none- NULL
## terms 3 terms callprediction1 = predict(cityRate1, data)
solution1 = data.frame(City = data$City, Cost.of.Living.Index = prediction1)
solution1## City Cost.of.Living.Index
## 1 Hamilton, Bermuda 127.41206
## 2 Zurich, Switzerland 126.98194
## 3 Basel, Switzerland 125.00242
## 4 Lausanne, Switzerland 119.82280
## 5 Bern, Switzerland 116.26170
## 6 Geneva, Switzerland 119.26418
## 7 Reykjavik, Iceland 111.93610
## 8 Lugano, Switzerland 111.87094
## 9 Stavanger, Norway 109.00475
## 10 Oslo, Norway 105.82958
## 11 Bergen, Norway 101.94797
## 12 New York, NY, United States 99.76272
## 13 Trondheim, Norway 100.24034
## 14 San Francisco, CA, United States 98.39653
## 15 Honolulu, HI, United States 94.52752
## 16 Anchorage, AK, United States 93.62732
## 17 Brooklyn, NY, United States 91.09982
## 18 Washington, DC, United States 88.90063
## 19 Santa Rosa, CA, United States 87.34150
## 20 Copenhagen, Denmark 87.80705
## 21 Charleston, SC, United States 87.09285
## 22 Luxembourg, Luxembourg 86.44859
## 23 Bellevue, WA, United States 85.51103
## 24 Seattle, WA, United States 85.88889
## 25 Tokyo, Japan 83.09603
## 26 Paris, France 83.68454
## 27 Odense, Denmark 84.55387
## 28 Berkeley, CA, United States 85.65315
## 29 Jersey City, NJ, United States 85.07813
## 30 Aalborg, Denmark 81.93423
## 31 Amsterdam, Netherlands 81.89656
## 32 Seoul, South Korea 81.75789
## 33 Arhus, Denmark 81.43718
## 34 London, United Kingdom 80.75546
## 35 Oakland, CA, United States 81.49285
## 36 Helsinki, Finland 80.92762
## 37 Boston, MA, United States 80.81146
## 38 Singapore, Singapore 79.74701
## 39 Dublin, Ireland 80.54777
## 40 Sydney, Australia 79.60450
## 41 Hartford, CT, United States 80.91091
## 42 Albany, NY, United States 79.11913
## 43 Philadelphia, PA, United States 79.09637
## 44 Tampere, Finland 78.61469
## 45 Milton Keynes, United Kingdom 78.19281
## 46 Grenoble, France 77.61729
## 47 Irvine, CA, United States 78.38139
## 48 Lyon, France 77.75320
## 49 Long Beach, CA, United States 78.03003
## 50 Linz, Austria 77.51731
## 51 Los Angeles, CA, United States 77.97383
## 52 Tel Aviv-Yafo, Israel 77.29822
## 53 Barrie, Canada 77.46293
## 54 Chicago, IL, United States 77.29212
## 55 Stockholm, Sweden 77.10927
## 56 Florence, Italy 76.97345
## 57 Boulder, CO, United States 77.37075
## 58 The Hague (Den Haag), Netherlands 76.51000
## 59 Reading, United Kingdom 76.57707
## 60 Auckland, New Zealand 76.14149
## 61 Jerusalem, Israel 76.50359
## 62 Bordeaux, France 76.25039
## 63 Utrecht, Netherlands 76.30416
## 64 Toulouse, France 75.82289
## 65 San Jose, CA, United States 76.68177
## 66 Burlington, VT, United States 76.26784
## 67 Pittsburgh, PA, United States 75.91152
## 68 Nice, France 75.95871
## 69 Miami, FL, United States 76.36846
## 70 Brussels, Belgium 75.85405
## 71 Graz, Austria 75.03983
## 72 Santa Barbara, CA, United States 76.82575
## 73 Sacramento, CA, United States 75.34513
## 74 Strasbourg, France 75.19221
## 75 Genoa, Italy 74.76054
## 76 Gent, Belgium 74.95447
## 77 Perth, Australia 74.75849
## 78 Antwerp, Belgium 74.92371
## 79 Portland, ME, United States 74.90684
## 80 West Palm Beach, FL, United States 74.77740
## 81 Hong Kong, Hong Kong 75.71255
## 82 Innsbruck, Austria 74.31923
## 83 Leuven, Belgium 74.39491
## 84 Leiden, Netherlands 74.35589
## 85 Osaka, Japan 73.16713
## 86 Melbourne, Australia 74.27834
## 87 Bath, United Kingdom 74.50210
## 88 Everett, WA, United States 74.47842
## 89 Saskatoon, Canada 74.18625
## 90 Tacoma, WA, United States 74.13872
## 91 Portland, OR, United States 74.30231
## 92 Rotterdam, Netherlands 73.74794
## 93 Montpellier, France 73.85323
## 94 St. John's, NL, Canada 74.15560
## 95 Milan, Italy 73.97799
## 96 Maastricht, Netherlands 73.79132
## 97 Baltimore, MD, United States 73.86615
## 98 Munich, Germany 73.77635
## 99 Espoo, Finland 73.81713
## 100 New Orleans, LA, United States 73.94830
## 101 Galway, Ireland 73.68561
## 102 Cork, Ireland 73.53507
## 103 Padova, Italy 73.09378
## 104 Haifa, Israel 72.79958
## 105 Charlotte, NC, United States 73.24371
## 106 Burlington, Canada 73.10137
## 107 Aberdeen, United Kingdom 73.01478
## 108 Dusseldorf, Germany 72.62219
## 109 Minneapolis, MN, United States 72.92552
## 110 Adelaide, Australia 72.67219
## 111 Eindhoven, Netherlands 72.89095
## 112 Cambridge, United Kingdom 72.83399
## 113 Oxford, United Kingdom 72.23921
## 114 Darwin, Australia 72.45754
## 115 Eugene, OR, United States 73.21414
## 116 Nantes, France 72.17729
## 117 Groningen, Netherlands 72.50146
## 118 San Diego, CA, United States 72.97978
## 119 Ramat Gan, Israel 72.17400
## 120 Hamburg, Germany 72.09231
## 121 Bellingham, WA, United States 72.12690
## 122 Atlanta, GA, United States 72.03743
## 123 Denver, CO, United States 72.44953
## 124 Saint Paul, MN, United States 72.23577
## 125 Hamilton, New Zealand 71.72857
## 126 Birmingham, AL, United States 71.80132
## 127 Frankfurt, Germany 71.63831
## 128 Wellington, New Zealand 71.30979
## 129 Asheville, NC, United States 71.75946
## 130 Trieste, Italy 71.39737
## 131 Fort Myers, FL, United States 71.71484
## 132 Newcastle, Australia 71.46656
## 133 Portsmouth, United Kingdom 71.04043
## 134 Halifax, Canada 70.90607
## 135 Vienna, Austria 70.75145
## 136 Heidelberg, Germany 70.45969
## 137 Indianapolis, IN, United States 70.79772
## 138 Edinburgh, United Kingdom 70.96488
## 139 Jacksonville, FL, United States 70.55341
## 140 Buffalo, NY, United States 70.57187
## 141 Olympia, WA, United States 70.58589
## 142 Saint Petersburg, FL, United States 70.56312
## 143 Austin, TX, United States 70.58423
## 144 Brisbane, Australia 70.36494
## 145 Male, Maldives 69.62966
## 146 Sliema, Malta 70.44442
## 147 Rochester, NY, United States 70.49979
## 148 Christchurch, New Zealand 70.05708
## 149 Toronto, Canada 70.33757
## 150 Orlando, FL, United States 70.48021
## 151 Dunedin, New Zealand 69.72480
## 152 Turku, Finland 69.81085
## 153 Plymouth, United Kingdom 69.87452
## 154 Swindon, United Kingdom 69.74465
## 155 Canberra, Australia 69.77822
## 156 Manchester, United Kingdom 69.87495
## 157 Peoria, IL, United States 69.66678
## 158 Gothenburg, Sweden 69.77949
## 159 Cleveland, OH, United States 69.71517
## 160 Vancouver, Canada 70.25878
## 161 Limerick, Ireland 69.71365
## 162 Bristol, United Kingdom 69.96574
## 163 Brighton, United Kingdom 69.86983
## 164 Bologna, Italy 69.51935
## 165 York, United Kingdom 69.44871
## 166 Karlsruhe, Germany 69.02641
## 167 Raleigh, NC, United States 69.37312
## 168 Bonn, Germany 69.00617
## 169 Hobart, Australia 69.32950
## 170 Arlington, TX, United States 68.84682
## 171 Rome, Italy 69.33667
## 172 Saint Louis, MO, United States 68.97036
## 173 Bremen, Germany 68.91573
## 174 Calgary, Canada 68.91708
## 175 Milwaukee, WI, United States 69.03895
## 176 Brampton, Canada 69.02001
## 177 Nashville, TN, United States 69.26849
## 178 Uppsala, Sweden 68.79336
## 179 Tampa, FL, United States 68.98862
## 180 Regina, Canada 68.55178
## 181 Mannheim, Germany 68.31155
## 182 Leeds, United Kingdom 68.47694
## 183 Virginia Beach, VA, United States 67.86948
## 184 Berlin, Germany 67.46907
## 185 Lille, France 67.71313
## 186 Syracuse, NY, United States 67.89935
## 187 Stuttgart, Germany 67.01813
## 188 Coquitlam, Canada 67.41216
## 189 Red Deer, Canada 67.19093
## 190 Cologne, Germany 67.28599
## 191 Aachen, Germany 66.88747
## 192 Tallahassee, FL, United States 67.17345
## 193 Bakersfield, CA, United States 67.08276
## 194 Ann Arbor, MI, United States 67.10476
## 195 Nottingham, United Kingdom 67.11182
## 196 Edmonton, Canada 67.07351
## 197 Las Vegas, NV, United States 67.02126
## 198 Columbus, OH, United States 66.89510
## 199 Turin, Italy 66.55604
## 200 Spokane, WA, United States 66.56097
## 201 Kelowna, Canada 66.76512
## 202 Exeter, United Kingdom 66.39631
## 203 Glasgow, United Kingdom 66.50770
## 204 Memphis, TN, United States 66.47428
## 205 Kingston, Canada 66.39095
## 206 Nuremberg, Germany 66.33477
## 207 Coventry, United Kingdom 66.37245
## 208 Columbia, SC, United States 66.36337
## 209 Victoria, Canada 66.59364
## 210 Malmo, Sweden 66.23593
## 211 Salem, OR, United States 66.04445
## 212 Leipzig, Germany 65.49996
## 213 Dresden, Germany 65.71352
## 214 Fort Wayne, IN, United States 65.84871
## 215 Dayton, OH, United States 65.79360
## 216 San Juan, Puerto Rico 65.49961
## 217 Taipei, Taiwan 65.36464
## 218 Kansas City, MO, United States 65.70779
## 219 Leicester, United Kingdom 65.42341
## 220 Oshawa, Canada 65.52501
## 221 Nanaimo, BC, Canada 65.46862
## 222 Fort Worth, TX, United States 65.28142
## 223 Palma de Mallorca, Spain 65.20499
## 224 Mississauga, Canada 65.26632
## 225 Quebec City, Canada 64.42656
## 226 Norwich, United Kingdom 64.90609
## 227 Burnaby, Canada 64.91131
## 228 Fayetteville, AR, United States 65.13595
## 229 Naples, Italy 63.98890
## 230 Derby, United Kingdom 64.48589
## 231 Marseille, France 64.63494
## 232 Kingston, Jamaica 63.77772
## 233 Hanover, Germany 64.48676
## 234 Richmond, VA, United States 64.98956
## 235 Gold Coast, Australia 64.94101
## 236 Greensboro, NC, United States 64.55888
## 237 Birmingham, United Kingdom 64.67446
## 238 Windsor, Canada 64.44382
## 239 Dallas, TX, United States 64.98246
## 240 Albuquerque, NM, United States 64.52050
## 241 Phoenix, AZ, United States 64.40494
## 242 Southampton, United Kingdom 63.81532
## 243 Gainesville, FL, United States 63.80958
## 244 Montreal, Canada 63.56625
## 245 Grand Rapids, MI, United States 63.69338
## 246 Tucson, AZ, United States 63.21996
## 247 Madison, WI, United States 63.56204
## 248 Chattanooga, TN, United States 63.30306
## 249 Fresno, CA, United States 63.81083
## 250 Wichita, KS, United States 63.10132
## 251 Winnipeg, Canada 63.13878
## 252 Cagliari, Italy 62.85427
## 253 Salt Lake City, UT, United States 63.18906
## 254 Ottawa, Canada 62.82702
## 255 Doha, Qatar 63.26906
## 256 Detroit, MI, United States 62.75877
## 257 Newcastle upon Tyne, United Kingdom 62.31438
## 258 Tulsa, OK, United States 62.75459
## 259 Cincinnati, OH, United States 62.66243
## 260 Sheffield, United Kingdom 62.74851
## 261 Belfast, United Kingdom 62.99184
## 262 Lubbock, TX, United States 62.52795
## 263 Taichung, Taiwan 61.77048
## 264 Des Moines, IA, United States 62.51755
## 265 Houston, TX, United States 63.36193
## 266 Barcelona, Spain 62.01661
## 267 Cardiff, United Kingdom 62.63438
## 268 Liverpool, United Kingdom 61.84959
## 269 Abu Dhabi, United Arab Emirates 63.12416
## 270 Oklahoma City, OK, United States 61.81479
## 271 Palermo, Italy 60.93986
## 272 Moncton, Canada 61.01361
## 273 Nicosia, Cyprus 61.09188
## 274 Knoxville, TN, United States 61.15104
## 275 Beirut, Lebanon 60.21434
## 276 Hamilton, Canada 60.71004
## 277 Springfield, MO, United States 61.06075
## 278 Vancouver, WA, United States 60.59597
## 279 Athens, Greece 59.28089
## 280 Toledo, OH, United States 60.04521
## 281 Little Rock, AR, United States 60.51593
## 282 Louisville, KY, United States 60.93239
## 283 Madrid, Spain 60.51159
## 284 Reno, NV, United States 60.58451
## 285 Huntsville, AL, United States 60.27256
## 286 Lexington, KY, United States 59.74517
## 287 Port of Spain, Trinidad And Tobago 59.35143
## 288 Boise, ID, United States 59.96830
## 289 El Paso, TX, United States 59.57358
## 290 Surrey, Canada 59.58670
## 291 London, Canada 59.32988
## 292 Abbotsford, Canada 59.30204
## 293 Kitchener, Canada 59.22452
## 294 San Antonio, TX, United States 58.74306
## 295 Montevideo, Uruguay 58.05436
## 296 Zaragoza (Saragossa), Spain 58.07346
## 297 Thessaloniki, Greece 57.12082
## 298 San Jose, Costa Rica 57.85657
## 299 Limassol, Cyprus 58.03171
## 300 Accra, Ghana 57.32064
## 301 Kaohsiung, Taiwan 56.06781
## 302 Ljubljana, Slovenia 56.08727
## 303 Valencia, Spain 55.22659
## 304 Manama, Bahrain 55.63212
## 305 Tallinn, Estonia 54.99208
## 306 Panama City, Panama 55.81164
## 307 Amman, Jordan 54.49869
## 308 Seville (Sevilla), Spain 54.58853
## 309 Larnaca, Cyprus 54.37315
## 310 Lisbon, Portugal 53.98422
## 311 Alicante, Spain 54.00460
## 312 Split, Croatia 53.38860
## 313 Bangkok, Thailand 53.20521
## 314 Sharjah, United Arab Emirates 53.23370
## 315 Dubai, United Arab Emirates 54.33863
## 316 Rijeka, Croatia 52.33886
## 317 Zagreb, Croatia 52.20375
## 318 Makati, Philippines 51.23037
## 319 Coimbra, Portugal 50.85606
## 320 Muscat, Oman 51.73641
## 321 Al Khobar, Saudi Arabia 50.82139
## 322 Funchal, Portugal 50.44808
## 323 Riga, Latvia 50.25105
## 324 Porto, Portugal 50.30981
## 325 Shanghai, China 51.76786
## 326 Granada, Spain 50.43295
## 327 Malaga, Spain 50.64922
## 328 Santiago, Chile 50.65069
## 329 Jeddah (Jiddah), Saudi Arabia 49.61942
## 330 Addis Ababa, Ethiopia 50.21621
## 331 Tartu, Estonia 49.63523
## 332 Havana, Cuba 48.05666
## 333 Quito, Ecuador 49.46383
## 334 Maribor, Slovenia 48.83078
## 335 Santa Cruz de Tenerife, Spain 49.13502
## 336 Riyadh, Saudi Arabia 48.70586
## 337 Bratislava, Slovakia 48.58093
## 338 Braga, Portugal 48.43102
## 339 Ad Dammam, Saudi Arabia 48.34871
## 340 Vilnius, Lithuania 48.21014
## 341 Prague, Czech Republic 48.16557
## 342 Bandar Seri Begawan, Brunei 48.47808
## 343 Harare, Zimbabwe 47.60459
## 344 Las Palmas de Gran Canaria, Spain 47.77642
## 345 San Salvador, El Salvador 47.34090
## 346 Guayaquil, Ecuador 47.25221
## 347 Baghdad, Iraq 47.10658
## 348 Phuket, Thailand 47.15587
## 349 Klaipeda, Lithuania 46.67158
## 350 Kosice, Slovakia 46.40665
## 351 Pretoria, South Africa 45.96629
## 352 Santo Domingo, Dominican Republic 45.84758
## 353 Kaunas, Lithuania 45.69901
## 354 Windhoek, Namibia 46.23604
## 355 Phnom Penh, Cambodia 45.65492
## 356 Johannesburg, South Africa 45.67001
## 357 Osijek, Croatia 44.22639
## 358 Brno, Czech Republic 44.88088
## 359 Moscow, Russia 44.84748
## 360 Selangor, Malaysia 44.10621
## 361 Campinas, Brazil 43.97773
## 362 Guatemala City, Guatemala 44.46347
## 363 Dar es Salaam, Tanzania 44.00861
## 364 Petaling Jaya, Malaysia 44.28117
## 365 Sao Paulo, Brazil 43.95434
## 366 Rio de Janeiro, Brazil 43.71884
## 367 Brasilia, Brazil 44.35686
## 368 Penang, Malaysia 43.82264
## 369 Beijing, China 44.93812
## 370 Budapest, Hungary 43.67249
## 371 Gdansk, Poland 42.89925
## 372 Johor Bahru, Malaysia 43.19220
## 373 Pattaya, Thailand 42.86228
## 374 Irbil, Iraq 42.41447
## 375 Kuala Lumpur, Malaysia 42.59999
## 376 Warsaw, Poland 42.65125
## 377 Shenzhen, China 43.30336
## 378 Kuching, Malaysia 41.21497
## 379 Kota Kinabalu, Malaysia 42.13162
## 380 Peterborough, United Kingdom 41.61236
## 381 Nairobi, Kenya 42.00714
## 382 Jakarta, Indonesia 41.86113
## 383 Cape Town, South Africa 42.67229
## 384 Bali, Indonesia 41.46844
## 385 Lima, Peru 41.56094
## 386 Olomouc, Czech Republic 41.43719
## 387 Gdynia, Poland 41.11060
## 388 Recife, Brazil 40.39905
## 389 Porto Alegre, Brazil 40.11121
## 390 Ostrava, Czech Republic 40.34089
## 391 Chiang Mai, Thailand 40.92082
## 392 Belo Horizonte, Brazil 40.02858
## 393 Durban, South Africa 40.62802
## 394 Bucharest, Romania 40.43236
## 395 Sofia, Bulgaria 40.36701
## 396 Guangzhou, China 40.99614
## 397 Florianopolis, Brazil 40.13104
## 398 Belgrade, Serbia 39.95131
## 399 Wroclaw, Poland 40.33291
## 400 Podgorica, Montenegro 39.72085
## 401 Krakow (Cracow), Poland 39.73012
## 402 Port Elizabeth, South Africa 39.45391
## 403 Saint Petersburg, Russia 39.86446
## 404 Sarajevo, Bosnia And Herzegovina 39.00157
## 405 Varna, Bulgaria 38.96599
## 406 Poznan, Poland 39.04387
## 407 Constanta, Romania 38.56452
## 408 Rabat, Morocco 38.52791
## 409 Buenos Aires, Argentina 38.69484
## 410 Bydgoszcz, Poland 38.48754
## 411 Szeged, Hungary 38.36727
## 412 Hanoi, Vietnam 38.39045
## 413 Curitiba, Brazil 37.83413
## 414 Timisoara, Romania 38.35665
## 415 Cluj-Napoca, Romania 38.33733
## 416 Debrecen, Hungary 37.90963
## 417 Suzhou, China 38.42683
## 418 Manila, Philippines 37.95618
## 419 Istanbul, Turkey 37.92339
## 420 Ho Chi Minh City, Vietnam 38.33947
## 421 Katowice, Poland 37.44571
## 422 Szczecin, Poland 37.18320
## 423 Chelyabinsk, Russia 37.21639
## 424 Tirana, Albania 37.10484
## 425 Lodz, Poland 37.15645
## 426 Brasov, Romania 37.19041
## 427 Banja Luka, Bosnia And Herzegovina 36.14932
## 428 Iasi, Romania 36.54432
## 429 Plovdiv, Bulgaria 36.29766
## 430 Cebu, Philippines 36.24426
## 431 Yekaterinburg, Russia 36.51520
## 432 Burgas, Bulgaria 36.09780
## 433 Chengdu, China 36.32537
## 434 Cuenca, Ecuador 36.16816
## 435 Lublin, Poland 36.10381
## 436 Colombo, Sri Lanka 36.10338
## 437 Samara, Russia 35.96180
## 438 Arad, Romania 35.70537
## 439 Surabaya, Indonesia 35.51891
## 440 Casablanca, Morocco 35.82791
## 441 Sibiu, Romania 35.77076
## 442 Bandung, Indonesia 35.48803
## 443 Paramaribo, Suriname 35.48510
## 444 Kaliningrad, Russia 35.38677
## 445 Novi Sad, Serbia 35.01693
## 446 Bogota, Colombia 35.03375
## 447 Yogyakarta, Indonesia 35.03588
## 448 Astana, Kazakhstan 35.18862
## 449 Ankara, Turkey 34.54518
## 450 Skopje, Macedonia 34.56061
## 451 Oradea, Romania 34.34695
## 452 Nis, Serbia 33.69531
## 453 Tehran, Iran 34.52349
## 454 Mexico City, Mexico 34.83677
## 455 Ulaanbaatar, Mongolia 34.27350
## 456 Monterrey, Mexico 34.41662
## 457 Minsk, Belarus 34.04643
## 458 Nizhny Novgorod, Russia 34.08355
## 459 Barranquilla, Colombia 33.77038
## 460 Izmir, Turkey 33.91164
## 461 Medellin, Colombia 33.98490
## 462 Antalya, Turkey 33.80350
## 463 Chisinau, Moldova 33.61274
## 464 Bursa, Turkey 33.39400
## 465 Kazan, Russia 33.91063
## 466 Novosibirsk, Russia 33.95217
## 467 Davao, Philippines 33.53669
## 468 Asuncion, Paraguay 33.53336
## 469 Algiers, Algeria 33.81490
## 470 Lagos, Nigeria 34.75175
## 471 Dumaguete, Philippines 33.54157
## 472 Yerevan, Armenia 33.16588
## 473 Tijuana, Mexico 32.88031
## 474 Almaty, Kazakhstan 32.49004
## 475 Rostov-na-donu, Russia 32.55195
## 476 Krasnodar, Russia 32.57752
## 477 Kathmandu, Nepal 31.19392
## 478 Craiova, Romania 31.64310
## 479 Voronezh, Russia 31.76475
## 480 Quezon City, Philippines 31.58947
## 481 Dhaka, Bangladesh 31.70874
## 482 Kampala, Uganda 31.53582
## 483 Guadalajara, Mexico 31.63811
## 484 Cancun, Mexico 31.54395
## 485 Queretaro, Mexico 31.37250
## 486 Gurgaon, India 30.73212
## 487 Cali, Colombia 30.27864
## 488 Tbilisi, Georgia 30.26830
## 489 Odessa, Ukraine 30.11027
## 490 Tashkent, Uzbekistan 30.17879
## 491 Puerto Vallarta, Mexico 30.64817
## 492 Kiev, Ukraine 29.94708
## 493 Baku, Azerbaijan 29.88229
## 494 Merida, Mexico 29.02831
## 495 Mumbai, India 30.96550
## 496 Puebla, Mexico 28.70904
## 497 Delhi, India 28.95598
## 498 Noida, India 28.44432
## 499 Dnipro, Ukraine 28.03252
## 500 Caracas, Venezuela 28.27932
## 501 Pune, India 27.60634
## 502 Lviv, Ukraine 27.44438
## 503 Ludhiana, India 26.83082
## 504 Bangalore, India 27.09653
## 505 Kharkiv, Ukraine 26.93260
## 506 Tunis, Tunisia 26.26434
## 507 Pristina, Kosovo (Disputed Territory) 26.24613
## 508 Chandigarh, India 25.99243
## 509 Islamabad, Pakistan 25.96858
## 510 Lahore, Pakistan 25.96024
## 511 Cairo, Egypt 25.85683
## 512 Jaipur, India 25.17892
## 513 Indore, India 25.32121
## 514 Thane, India 25.84083
## 515 Chennai, India 25.60197
## 516 Kolkata, India 25.03302
## 517 Lucknow (Lakhnau), India 24.64763
## 518 Goa, India 24.79853
## 519 Ahmedabad, India 24.41087
## 520 Alexandria, Egypt 24.05478
## 521 Karachi, Pakistan 24.20715
## 522 Sumy, Ukraine 23.48322
## 523 Surat, India 23.82096
## 524 Hyderabad, India 23.84720
## 525 Nagpur, India 22.76399
## 526 Guwahati, India 22.55710
## 527 Mysore, India 22.53296
## 528 Bhubaneswar, India 22.45826
## 529 Mangalore, India 22.43153
## 530 Coimbatore, India 22.42338
## 531 Bhopal, India 22.29332
## 532 Vadodara, India 22.34692
## 533 Kochi, India 21.72453
## 534 Visakhapatnam, India 21.96622
## 535 Navi Mumbai, India 20.08061
## 536 Thiruvananthapuram, India 19.92843Here we notice that the MSE of the random forest is quite low. The results of classifying the cities by cost of living is pretty accurate in many cases. Of course this is due to the fact that we are using the whole data set for both training the model and running the model.
Random Forest Analysis with test and training to predict Cost of Living
library(randomForest)
trainindex <- sample(1:nrow(data), 200)
train <- droplevels(data[trainindex, ])
test <- droplevels(data[-trainindex, ])
#cityRate2 = randomForest(Cost.of.Living.Index ~ Rank + Rent.Index + Cost.of.Living.Plus.Rent.Index + Groceries.Index + Restaurant.Price.Index + Local.Purchasing.Power.Index, data = train, ntree = 500, mtry = 2, importance = TRUE)#limit randomise variable for forest
cityRate2 = randomForest(Cost.of.Living.Index ~ Rank + Cost.of.Living.Plus.Rent.Index + Groceries.Index + Restaurant.Price.Index, data = train, ntree = 100, mtry = 2, importance = TRUE, do.trace=T)#limit randomise variable for forest, shown that rent and local purchasing power were not very important at all compared to other variables## | Out-of-bag |
## Tree | MSE %Var(y) |
## 1 | 15.33 4.31 |
## 2 | 10.66 3.00 |
## 3 | 7.978 2.24 |
## 4 | 7.721 2.17 |
## 5 | 6.738 1.90 |
## 6 | 6.56 1.85 |
## 7 | 7.385 2.08 |
## 8 | 7.03 1.98 |
## 9 | 8.426 2.37 |
## 10 | 7.11 2.00 |
## 11 | 6.892 1.94 |
## 12 | 6.444 1.81 |
## 13 | 6.218 1.75 |
## 14 | 5.919 1.67 |
## 15 | 5.667 1.59 |
## 16 | 5.724 1.61 |
## 17 | 5.028 1.41 |
## 18 | 4.882 1.37 |
## 19 | 4.889 1.38 |
## 20 | 4.784 1.35 |
## 21 | 4.767 1.34 |
## 22 | 4.988 1.40 |
## 23 | 4.792 1.35 |
## 24 | 4.618 1.30 |
## 25 | 4.388 1.23 |
## 26 | 4.404 1.24 |
## 27 | 4.611 1.30 |
## 28 | 4.592 1.29 |
## 29 | 4.449 1.25 |
## 30 | 4.462 1.26 |
## 31 | 4.498 1.27 |
## 32 | 4.682 1.32 |
## 33 | 4.647 1.31 |
## 34 | 4.582 1.29 |
## 35 | 4.787 1.35 |
## 36 | 4.76 1.34 |
## 37 | 4.738 1.33 |
## 38 | 4.707 1.32 |
## 39 | 4.696 1.32 |
## 40 | 4.673 1.32 |
## 41 | 4.693 1.32 |
## 42 | 4.681 1.32 |
## 43 | 4.7 1.32 |
## 44 | 4.736 1.33 |
## 45 | 4.722 1.33 |
## 46 | 4.711 1.33 |
## 47 | 4.586 1.29 |
## 48 | 4.591 1.29 |
## 49 | 4.583 1.29 |
## 50 | 4.503 1.27 |
## 51 | 4.625 1.30 |
## 52 | 4.603 1.30 |
## 53 | 4.582 1.29 |
## 54 | 4.578 1.29 |
## 55 | 4.796 1.35 |
## 56 | 4.834 1.36 |
## 57 | 4.812 1.35 |
## 58 | 4.842 1.36 |
## 59 | 4.839 1.36 |
## 60 | 4.8 1.35 |
## 61 | 4.654 1.31 |
## 62 | 4.64 1.31 |
## 63 | 4.586 1.29 |
## 64 | 4.579 1.29 |
## 65 | 4.508 1.27 |
## 66 | 4.51 1.27 |
## 67 | 4.517 1.27 |
## 68 | 4.506 1.27 |
## 69 | 4.509 1.27 |
## 70 | 4.562 1.28 |
## 71 | 4.581 1.29 |
## 72 | 4.571 1.29 |
## 73 | 4.533 1.28 |
## 74 | 4.486 1.26 |
## 75 | 4.479 1.26 |
## 76 | 4.502 1.27 |
## 77 | 4.501 1.27 |
## 78 | 4.505 1.27 |
## 79 | 4.415 1.24 |
## 80 | 4.422 1.24 |
## 81 | 4.479 1.26 |
## 82 | 4.491 1.26 |
## 83 | 4.5 1.27 |
## 84 | 4.489 1.26 |
## 85 | 4.498 1.27 |
## 86 | 4.469 1.26 |
## 87 | 4.474 1.26 |
## 88 | 4.548 1.28 |
## 89 | 4.556 1.28 |
## 90 | 4.542 1.28 |
## 91 | 4.557 1.28 |
## 92 | 4.594 1.29 |
## 93 | 4.596 1.29 |
## 94 | 4.616 1.30 |
## 95 | 4.593 1.29 |
## 96 | 4.587 1.29 |
## 97 | 4.587 1.29 |
## 98 | 4.563 1.28 |
## 99 | 4.59 1.29 |
## 100 | 4.659 1.31 |cityRate2##
## Call:
## randomForest(formula = Cost.of.Living.Index ~ Rank + Cost.of.Living.Plus.Rent.Index + Groceries.Index + Restaurant.Price.Index, data = train, ntree = 100, mtry = 2, importance = TRUE, do.trace = T)
## Type of random forest: regression
## Number of trees: 100
## No. of variables tried at each split: 2
##
## Mean of squared residuals: 4.658718
## % Var explained: 98.69importance(cityRate2)## %IncMSE IncNodePurity
## Rank 12.571083 33650.779
## Cost.of.Living.Plus.Rent.Index 7.990728 22340.411
## Groceries.Index 5.038499 10561.654
## Restaurant.Price.Index 3.830426 3277.884summary(cityRate2)## Length Class Mode
## call 7 -none- call
## type 1 -none- character
## predicted 200 -none- numeric
## mse 100 -none- numeric
## rsq 100 -none- numeric
## oob.times 200 -none- numeric
## importance 8 -none- numeric
## importanceSD 4 -none- numeric
## localImportance 0 -none- NULL
## proximity 0 -none- NULL
## ntree 1 -none- numeric
## mtry 1 -none- numeric
## forest 11 -none- list
## coefs 0 -none- NULL
## y 200 -none- numeric
## test 0 -none- NULL
## inbag 0 -none- NULL
## terms 3 terms callprediction2 = predict(cityRate2, test)
#prediction
solution2 = data.frame(City = test$City, Cost.of.Living.Index = prediction2)
solution2## City Cost.of.Living.Index
## 1 Hamilton, Bermuda 104.03236
## 2 Zurich, Switzerland 104.03236
## 3 Basel, Switzerland 104.03236
## 4 Lausanne, Switzerland 104.03236
## 6 Geneva, Switzerland 104.03236
## 7 Reykjavik, Iceland 102.90031
## 8 Lugano, Switzerland 102.90031
## 9 Stavanger, Norway 100.13967
## 10 Oslo, Norway 99.47534
## 11 Bergen, Norway 97.72010
## 12 New York, NY, United States 98.31244
## 14 San Francisco, CA, United States 97.65965
## 16 Anchorage, AK, United States 91.52978
## 17 Brooklyn, NY, United States 95.49747
## 18 Washington, DC, United States 92.30344
## 19 Santa Rosa, CA, United States 89.50353
## 20 Copenhagen, Denmark 89.24929
## 21 Charleston, SC, United States 87.29524
## 23 Bellevue, WA, United States 84.14185
## 24 Seattle, WA, United States 86.70293
## 26 Paris, France 82.50453
## 27 Odense, Denmark 85.11805
## 29 Jersey City, NJ, United States 85.96688
## 30 Aalborg, Denmark 81.97470
## 32 Seoul, South Korea 84.45318
## 33 Arhus, Denmark 81.56025
## 34 London, United Kingdom 81.40358
## 35 Oakland, CA, United States 81.96229
## 36 Helsinki, Finland 80.22119
## 37 Boston, MA, United States 80.78837
## 39 Dublin, Ireland 80.27090
## 41 Hartford, CT, United States 82.11122
## 43 Philadelphia, PA, United States 78.86869
## 45 Milton Keynes, United Kingdom 78.35432
## 47 Irvine, CA, United States 78.82873
## 48 Lyon, France 77.77949
## 51 Los Angeles, CA, United States 78.34391
## 52 Tel Aviv-Yafo, Israel 76.79567
## 53 Barrie, Canada 77.45305
## 55 Stockholm, Sweden 76.60722
## 56 Florence, Italy 76.91077
## 58 The Hague (Den Haag), Netherlands 76.24380
## 60 Auckland, New Zealand 75.79287
## 61 Jerusalem, Israel 76.05803
## 64 Toulouse, France 75.65156
## 67 Pittsburgh, PA, United States 75.78153
## 68 Nice, France 76.57109
## 69 Miami, FL, United States 76.28273
## 72 Santa Barbara, CA, United States 77.62234
## 73 Sacramento, CA, United States 75.51519
## 74 Strasbourg, France 74.48188
## 75 Genoa, Italy 74.10887
## 80 West Palm Beach, FL, United States 75.03441
## 82 Innsbruck, Austria 74.18050
## 85 Osaka, Japan 73.42993
## 86 Melbourne, Australia 74.41385
## 88 Everett, WA, United States 74.73016
## 89 Saskatoon, Canada 74.22029
## 90 Tacoma, WA, United States 74.41668
## 91 Portland, OR, United States 74.62424
## 94 St. John's, NL, Canada 73.98430
## 96 Maastricht, Netherlands 73.71090
## 97 Baltimore, MD, United States 74.24824
## 99 Espoo, Finland 74.54327
## 101 Galway, Ireland 73.84499
## 102 Cork, Ireland 73.66031
## 103 Padova, Italy 73.08508
## 105 Charlotte, NC, United States 73.84381
## 106 Burlington, Canada 73.26976
## 107 Aberdeen, United Kingdom 73.94920
## 108 Dusseldorf, Germany 72.51661
## 110 Adelaide, Australia 72.85524
## 112 Cambridge, United Kingdom 73.05487
## 113 Oxford, United Kingdom 72.96034
## 114 Darwin, Australia 72.86884
## 116 Nantes, France 72.01849
## 117 Groningen, Netherlands 72.70068
## 119 Ramat Gan, Israel 72.27245
## 120 Hamburg, Germany 72.18772
## 121 Bellingham, WA, United States 72.85749
## 122 Atlanta, GA, United States 72.28870
## 123 Denver, CO, United States 73.01208
## 124 Saint Paul, MN, United States 72.51831
## 126 Birmingham, AL, United States 71.80205
## 127 Frankfurt, Germany 71.05667
## 128 Wellington, New Zealand 70.28482
## 129 Asheville, NC, United States 71.55008
## 130 Trieste, Italy 70.55674
## 131 Fort Myers, FL, United States 71.49963
## 132 Newcastle, Australia 71.00180
## 134 Halifax, Canada 70.02871
## 135 Vienna, Austria 70.40006
## 136 Heidelberg, Germany 69.65867
## 138 Edinburgh, United Kingdom 70.56909
## 139 Jacksonville, FL, United States 70.34468
## 140 Buffalo, NY, United States 70.29411
## 143 Austin, TX, United States 70.40685
## 144 Brisbane, Australia 70.04270
## 149 Toronto, Canada 69.89328
## 150 Orlando, FL, United States 70.66464
## 151 Dunedin, New Zealand 68.40566
## 154 Swindon, United Kingdom 69.35422
## 155 Canberra, Australia 69.76497
## 157 Peoria, IL, United States 68.79248
## 158 Gothenburg, Sweden 69.71944
## 162 Bristol, United Kingdom 69.75989
## 163 Brighton, United Kingdom 69.61314
## 164 Bologna, Italy 69.14430
## 165 York, United Kingdom 69.15231
## 166 Karlsruhe, Germany 68.68930
## 170 Arlington, TX, United States 68.22934
## 172 Saint Louis, MO, United States 69.02321
## 176 Brampton, Canada 68.77261
## 178 Uppsala, Sweden 68.63182
## 180 Regina, Canada 68.20732
## 181 Mannheim, Germany 68.03884
## 183 Virginia Beach, VA, United States 68.35326
## 187 Stuttgart, Germany 66.64349
## 189 Red Deer, Canada 67.11470
## 190 Cologne, Germany 67.32092
## 191 Aachen, Germany 66.35946
## 192 Tallahassee, FL, United States 66.74491
## 193 Bakersfield, CA, United States 67.41509
## 194 Ann Arbor, MI, United States 66.66783
## 196 Edmonton, Canada 67.10056
## 197 Las Vegas, NV, United States 67.29387
## 198 Columbus, OH, United States 66.55040
## 199 Turin, Italy 66.23837
## 200 Spokane, WA, United States 66.44899
## 201 Kelowna, Canada 66.03472
## 204 Memphis, TN, United States 66.37594
## 205 Kingston, Canada 65.59831
## 208 Columbia, SC, United States 66.31834
## 210 Malmo, Sweden 66.30709
## 211 Salem, OR, United States 65.46990
## 212 Leipzig, Germany 64.36551
## 213 Dresden, Germany 64.51276
## 216 San Juan, Puerto Rico 64.89743
## 221 Nanaimo, BC, Canada 65.19104
## 222 Fort Worth, TX, United States 65.64619
## 223 Palma de Mallorca, Spain 65.50244
## 226 Norwich, United Kingdom 64.61817
## 228 Fayetteville, AR, United States 65.58823
## 229 Naples, Italy 63.58837
## 231 Marseille, France 64.55103
## 232 Kingston, Jamaica 62.95247
## 233 Hanover, Germany 64.37431
## 237 Birmingham, United Kingdom 64.62973
## 238 Windsor, Canada 64.59054
## 239 Dallas, TX, United States 65.19157
## 241 Phoenix, AZ, United States 64.60788
## 243 Gainesville, FL, United States 63.95667
## 244 Montreal, Canada 64.08488
## 245 Grand Rapids, MI, United States 64.20381
## 246 Tucson, AZ, United States 63.47436
## 247 Madison, WI, United States 64.02380
## 248 Chattanooga, TN, United States 63.12476
## 249 Fresno, CA, United States 63.74212
## 250 Wichita, KS, United States 62.81417
## 251 Winnipeg, Canada 62.03058
## 252 Cagliari, Italy 62.40669
## 254 Ottawa, Canada 62.42389
## 256 Detroit, MI, United States 61.70124
## 258 Tulsa, OK, United States 62.56967
## 261 Belfast, United Kingdom 63.22099
## 262 Lubbock, TX, United States 62.50871
## 263 Taichung, Taiwan 61.47106
## 267 Cardiff, United Kingdom 62.98387
## 269 Abu Dhabi, United Arab Emirates 63.12627
## 270 Oklahoma City, OK, United States 61.19552
## 271 Palermo, Italy 60.71524
## 272 Moncton, Canada 60.81166
## 274 Knoxville, TN, United States 60.73575
## 275 Beirut, Lebanon 59.86382
## 276 Hamilton, Canada 60.48480
## 278 Vancouver, WA, United States 61.29843
## 279 Athens, Greece 57.43206
## 280 Toledo, OH, United States 59.57928
## 281 Little Rock, AR, United States 60.27400
## 283 Madrid, Spain 60.83777
## 284 Reno, NV, United States 61.09048
## 286 Lexington, KY, United States 59.65141
## 287 Port of Spain, Trinidad And Tobago 58.53581
## 293 Kitchener, Canada 58.94516
## 295 Montevideo, Uruguay 58.08831
## 296 Zaragoza (Saragossa), Spain 58.04704
## 297 Thessaloniki, Greece 55.60286
## 299 Limassol, Cyprus 58.19133
## 303 Valencia, Spain 54.98044
## 304 Manama, Bahrain 57.47329
## 305 Tallinn, Estonia 54.05103
## 306 Panama City, Panama 57.68228
## 307 Amman, Jordan 53.91286
## 308 Seville (Sevilla), Spain 54.37064
## 309 Larnaca, Cyprus 53.90266
## 311 Alicante, Spain 53.43095
## 313 Bangkok, Thailand 55.77512
## 315 Dubai, United Arab Emirates 56.76962
## 318 Makati, Philippines 51.91504
## 322 Funchal, Portugal 49.88548
## 323 Riga, Latvia 48.65663
## 324 Porto, Portugal 50.05340
## 325 Shanghai, China 53.48444
## 326 Granada, Spain 49.31267
## 330 Addis Ababa, Ethiopia 51.18411
## 331 Tartu, Estonia 49.05638
## 332 Havana, Cuba 46.03940
## 333 Quito, Ecuador 50.94840
## 334 Maribor, Slovenia 47.43576
## 335 Santa Cruz de Tenerife, Spain 48.54857
## 336 Riyadh, Saudi Arabia 48.51464
## 337 Bratislava, Slovakia 48.59864
## 339 Ad Dammam, Saudi Arabia 46.68961
## 340 Vilnius, Lithuania 46.93245
## 341 Prague, Czech Republic 48.05017
## 342 Bandar Seri Begawan, Brunei 48.92199
## 343 Harare, Zimbabwe 46.91242
## 345 San Salvador, El Salvador 48.43129
## 346 Guayaquil, Ecuador 47.01021
## 347 Baghdad, Iraq 46.21447
## 349 Klaipeda, Lithuania 44.99345
## 350 Kosice, Slovakia 45.61954
## 351 Pretoria, South Africa 45.19160
## 352 Santo Domingo, Dominican Republic 44.46692
## 353 Kaunas, Lithuania 44.09563
## 355 Phnom Penh, Cambodia 47.18939
## 357 Osijek, Croatia 43.43119
## 358 Brno, Czech Republic 45.30322
## 359 Moscow, Russia 45.87213
## 360 Selangor, Malaysia 43.54554
## 361 Campinas, Brazil 43.20627
## 364 Petaling Jaya, Malaysia 43.99786
## 367 Brasilia, Brazil 43.43004
## 368 Penang, Malaysia 44.18023
## 370 Budapest, Hungary 43.42781
## 371 Gdansk, Poland 42.88627
## 373 Pattaya, Thailand 43.85470
## 377 Shenzhen, China 44.90151
## 379 Kota Kinabalu, Malaysia 42.36568
## 381 Nairobi, Kenya 42.05067
## 383 Cape Town, South Africa 44.51920
## 384 Bali, Indonesia 42.65253
## 387 Gdynia, Poland 41.33786
## 388 Recife, Brazil 40.87580
## 389 Porto Alegre, Brazil 40.62212
## 390 Ostrava, Czech Republic 40.65931
## 391 Chiang Mai, Thailand 42.64141
## 392 Belo Horizonte, Brazil 40.14269
## 393 Durban, South Africa 40.46790
## 394 Bucharest, Romania 40.45230
## 395 Sofia, Bulgaria 39.75071
## 396 Guangzhou, China 41.25306
## 397 Florianopolis, Brazil 39.32208
## 399 Wroclaw, Poland 40.08035
## 400 Podgorica, Montenegro 39.36841
## 401 Krakow (Cracow), Poland 39.58986
## 402 Port Elizabeth, South Africa 39.33117
## 406 Poznan, Poland 39.20816
## 407 Constanta, Romania 38.22172
## 408 Rabat, Morocco 39.01396
## 409 Buenos Aires, Argentina 38.96663
## 410 Bydgoszcz, Poland 38.95252
## 411 Szeged, Hungary 37.83932
## 413 Curitiba, Brazil 37.28064
## 414 Timisoara, Romania 38.69028
## 417 Suzhou, China 39.27982
## 418 Manila, Philippines 38.59029
## 419 Istanbul, Turkey 38.18434
## 420 Ho Chi Minh City, Vietnam 38.57153
## 421 Katowice, Poland 37.84372
## 422 Szczecin, Poland 37.58042
## 424 Tirana, Albania 37.41716
## 425 Lodz, Poland 37.48019
## 426 Brasov, Romania 37.12035
## 427 Banja Luka, Bosnia And Herzegovina 35.98841
## 428 Iasi, Romania 36.89030
## 429 Plovdiv, Bulgaria 36.20130
## 430 Cebu, Philippines 35.93109
## 431 Yekaterinburg, Russia 36.49554
## 432 Burgas, Bulgaria 35.90275
## 433 Chengdu, China 36.37540
## 436 Colombo, Sri Lanka 36.04821
## 437 Samara, Russia 36.23845
## 439 Surabaya, Indonesia 35.60134
## 440 Casablanca, Morocco 36.59775
## 441 Sibiu, Romania 35.60108
## 442 Bandung, Indonesia 35.29545
## 446 Bogota, Colombia 35.30284
## 447 Yogyakarta, Indonesia 35.05345
## 449 Ankara, Turkey 34.48987
## 450 Skopje, Macedonia 34.55490
## 451 Oradea, Romania 34.06943
## 452 Nis, Serbia 33.34527
## 453 Tehran, Iran 35.79493
## 454 Mexico City, Mexico 35.99141
## 460 Izmir, Turkey 33.85714
## 463 Chisinau, Moldova 33.55206
## 464 Bursa, Turkey 33.09792
## 465 Kazan, Russia 33.93267
## 466 Novosibirsk, Russia 34.07051
## 467 Davao, Philippines 33.27286
## 468 Asuncion, Paraguay 33.01683
## 470 Lagos, Nigeria 35.85992
## 472 Yerevan, Armenia 32.86295
## 476 Krasnodar, Russia 32.45217
## 477 Kathmandu, Nepal 31.39274
## 478 Craiova, Romania 31.34190
## 480 Quezon City, Philippines 31.05018
## 485 Queretaro, Mexico 31.77539
## 487 Cali, Colombia 30.44753
## 489 Odessa, Ukraine 29.73155
## 494 Merida, Mexico 28.67106
## 496 Puebla, Mexico 28.13502
## 497 Delhi, India 29.68644
## 499 Dnipro, Ukraine 27.61716
## 500 Caracas, Venezuela 28.74864
## 501 Pune, India 27.93417
## 502 Lviv, Ukraine 27.28263
## 503 Ludhiana, India 26.35986
## 506 Tunis, Tunisia 25.43594
## 508 Chandigarh, India 26.04387
## 510 Lahore, Pakistan 25.69624
## 512 Jaipur, India 25.34751
## 513 Indore, India 24.72951
## 518 Goa, India 25.33686
## 519 Ahmedabad, India 24.70326
## 520 Alexandria, Egypt 23.54235
## 521 Karachi, Pakistan 24.01317
## 522 Sumy, Ukraine 21.85227
## 523 Surat, India 23.02095
## 527 Mysore, India 22.38407
## 528 Bhubaneswar, India 22.34519
## 529 Mangalore, India 22.48082
## 530 Coimbatore, India 22.36722
## 531 Bhopal, India 21.40214
## 532 Vadodara, India 21.99751Here we implement the idea of having two seperate datasets by splitting the data in train and test. This produces a bigger MSE and a bit less accuracy however it performs well at classifying unseen data with a cost of living and is still viable at classifying for cost of living each city. As this is a Random Forest algorithm, cross validation is unnecessary for overfitting problem due to the OOB error estimate as it is tested internally. We can also see from the commented out model that rent and local purchasing power were ineffective for the model so we decided to leave them out
Neural Net Analysis
Here we build our neural network to try and analyze the data. We build the model with the full dataset first here. We have to first normalize the data.
library(NeuralNetTools)## Warning: package 'NeuralNetTools' was built under R version 3.4.4library(neuralnet)## Warning: package 'neuralnet' was built under R version 3.4.4nums = unlist(lapply(data, is.numeric))
dataNums = data[ , nums]
scar <- apply(dataNums, 2, function(v) (v-min(v))/(max(v)-min(v)))
ind <- sample(1:nrow(scar), 300)
train <- scar[ind, ]
test <- scar[-ind, ]
nn = neuralnet(Cost.of.Living.Index ~ Rank + Cost.of.Living.Plus.Rent.Index + Groceries.Index + Restaurant.Price.Index, data=scar, hidden=c(5,3), linear.output = TRUE)
nn$result.matrix## [,1]
## error 0.020307853
## reached.threshold 0.009143724
## steps 767.000000000
## Intercept.to.1layhid1 -0.110891100
## Rank.to.1layhid1 1.841907099
## Cost.of.Living.Plus.Rent.Index.to.1layhid1 -0.736582303
## Groceries.Index.to.1layhid1 -1.484949063
## Restaurant.Price.Index.to.1layhid1 0.574919356
## Intercept.to.1layhid2 -0.290268527
## Rank.to.1layhid2 1.076804470
## Cost.of.Living.Plus.Rent.Index.to.1layhid2 -1.899135650
## Groceries.Index.to.1layhid2 -1.557892751
## Restaurant.Price.Index.to.1layhid2 -1.244089645
## Intercept.to.1layhid3 4.698671247
## Rank.to.1layhid3 0.745957867
## Cost.of.Living.Plus.Rent.Index.to.1layhid3 -2.865393266
## Groceries.Index.to.1layhid3 -6.172097642
## Restaurant.Price.Index.to.1layhid3 -3.005127313
## Intercept.to.1layhid4 -2.288680551
## Rank.to.1layhid4 -20.627020477
## Cost.of.Living.Plus.Rent.Index.to.1layhid4 -0.683558029
## Groceries.Index.to.1layhid4 1.036948723
## Restaurant.Price.Index.to.1layhid4 1.755113581
## Intercept.to.1layhid5 -0.894689628
## Rank.to.1layhid5 -0.919745950
## Cost.of.Living.Plus.Rent.Index.to.1layhid5 -0.381917632
## Groceries.Index.to.1layhid5 1.148948433
## Restaurant.Price.Index.to.1layhid5 1.424561188
## Intercept.to.2layhid1 0.031033814
## 1layhid1.to.2layhid1 1.845423760
## 1layhid2.to.2layhid1 1.888443301
## 1layhid3.to.2layhid1 -1.991515450
## 1layhid4.to.2layhid1 -0.641293760
## 1layhid5.to.2layhid1 -0.124361091
## Intercept.to.2layhid2 -1.993918611
## 1layhid1.to.2layhid2 -2.421733319
## 1layhid2.to.2layhid2 -1.599396199
## 1layhid3.to.2layhid2 0.186642670
## 1layhid4.to.2layhid2 3.118298756
## 1layhid5.to.2layhid2 1.500980215
## Intercept.to.2layhid3 0.147514217
## 1layhid1.to.2layhid3 0.433538961
## 1layhid2.to.2layhid3 1.746232285
## 1layhid3.to.2layhid3 -0.504038074
## 1layhid4.to.2layhid3 -0.320427369
## 1layhid5.to.2layhid3 -1.510386090
## Intercept.to.Cost.of.Living.Index 0.869978586
## 2layhid1.to.Cost.of.Living.Index -0.209994841
## 2layhid2.to.Cost.of.Living.Index 0.843154780
## 2layhid3.to.Cost.of.Living.Index -0.963293971plot(nn)
summary(nn)## Length Class Mode
## call 5 -none- call
## response 536 -none- numeric
## covariate 2144 -none- numeric
## model.list 2 -none- list
## err.fct 1 -none- function
## act.fct 1 -none- function
## linear.output 1 -none- logical
## data 7 data.frame list
## exclude 0 -none- NULL
## net.result 1 -none- list
## weights 1 -none- list
## generalized.weights 1 -none- list
## startweights 1 -none- list
## result.matrix 50 -none- numericWe see a low error rate of .02964 from the neural network when using the full dataset to complete its task. This is quite respectable but we want to know if we are overfitting which is quite possible. Below we implement the same neural network but with a test and train seperation
Using test data for accuracy rate
nn2 = neuralnet(Cost.of.Living.Index ~ Rank + Cost.of.Living.Plus.Rent.Index + Groceries.Index + Restaurant.Price.Index, data=train, hidden=c(5,3), linear.output = TRUE)
nn.results <- compute(nn2, test)
result <- nn.results$net.result
original_values <- max.col(scar)
results <- max.col(result)
mean(results == original_values)#accuracy rate## Warning in results == original_values: longer object length is not a
## multiple of shorter object length## [1] 0.4570896sum((compute(nn2, test[,-2])$net.result-test[,2])^2)## [1] 0.03471869The result of accuracy now for the neural network is at almost 46%. This shows to be very low. We want to see if we can make this any better. Therefore we perform K-Fold CV on the neural net below to see if there is significantly better at building the neural network to get more accurate results
K-Fold - Neural Net
# 10 fold cross validation
k <- 10
# Results from cv
outs <- NULL
# Train test split proportions
proportion <- 0.95 # Set to 0.995 for LOOCV
for(i in 1:k)
{
index <- sample(1:nrow(scar), round(proportion*nrow(scar)))
train_cv <- scar[index, ]
test_cv <- scar[-index, ]
nn_cv <- neuralnet(Cost.of.Living.Index ~ Rank + Rent.Index + Cost.of.Living.Plus.Rent.Index + Groceries.Index + Restaurant.Price.Index + Local.Purchasing.Power.Index,
data = train,
hidden = c(13, 10, 3),
act.fct = "logistic",
linear.output = FALSE)
# Compute predictions
pr.nn <- compute(nn_cv, test)
# Extract results
pr.nn_ <- pr.nn$net.result
# Accuracy (test set)
original_values <- max.col(test)
pr.nn_2 <- max.col(pr.nn_)
outs[i] <- mean(pr.nn_2 == original_values)
}
outs## [1] 0.4491525 0.4491525 0.4491525 0.4491525 0.4491525 0.4491525 0.4491525
## [8] 0.4491525 0.4491525 0.4491525mean(outs)## [1] 0.4491525After performing the CV we realize that the neural network is about average of 47% accurate which is almost exactly of what we get above. Therefore this neural network would not be a very good choice to use to predict Cost of Living index